Best Cardio for Bodybuilding: Combos That Keep Your Muscle

What Is the Interference Effect and Why Does It Matter for Bodybuilders?

The interference effect is the tendency for endurance training to blunt some strength and size adaptations.^[1] For a bodybuilder the practical question is narrower: does adding cardio cost muscle when the lifting program stays identical, and the pooled answer is mostly no.

• Hypertrophy held steady: the pooled effect of concurrent aerobic and strength training on muscle hypertrophy was -0.01 standardized mean difference, which is effectively zero.
• Maximal strength held steady: the pooled effect for maximal strength was -0.06, again far from a meaningful loss.
• Explosive strength dipped: the pooled effect for explosive strength was -0.28, a small attenuation that matters more to power athletes than to physique goals.
• Most moderators stayed neutral: cycling versus running, weekly training frequency, training status, and age did not significantly change the picture.

That last point is the reason this article focuses on dose, modality, and placement rather than on avoiding cardio altogether, and why the cardio and bodybuilding conversation is really about dosing and scheduling. Build the lifting half first, because a 4 day workout split sets the weekly frame that every cardio decision hangs on.

Best Cardio for Muscle Gain: Which Cardio Type Preserves Muscle Best?

The best cardio for building muscle is cycling, incline walking, or the elliptical. These modes add energy expenditure with almost no eccentric damage, and a pooled analysis of 15 studies found only a small negative effect of concurrent training on muscle fiber hypertrophy, one that grew larger for type I fibers when the aerobic work was running rather than cycling.^[2]

Impact and eccentric columns describe mechanical loading of the mode itself, not a ranking of calorie burn.

Modality also interacts with intensity. A network meta-analysis of 40 studies and 841 participants found that every concurrent training modality trailed strength training alone for lower-body maximal strength, and that high-intensity interval running was the modality that limited the damage best.^[3]

In practice the best cardio for gaining muscle is the mode you can repeat two or three times a week without soreness bleeding into leg day, which is usually steady incline walking or easy cycling.

How to pick intensity without guessing

Use a hard ceiling instead of a target, so easy days stay genuinely easy and do not borrow from the next lifting session.

• Talk test: you can speak a full sentence but not sing through the line.
• Heart rate reserve: roughly 60 to 70 percent of the way between resting and maximum heart rate.
• Session RPE: keep steady-state work at 4 to 6 out of 10, and reserve 8 or higher for genuinely short intervals.
• Recovery check: if the mode leaves your legs heavy for the next 24 hours, drop intensity before you drop the session.

If you still want high-intensity work, keep it inside the limits in this HIIT workouts for cardio breakdown. Use benchmark conditioning workouts when you want a fixed yardstick for progress instead of a new random session each week.

How Much Cardio Should You Do While Bulking?

Two or three easy sessions of 20 to 40 minutes per week is enough for most lifters in a surplus. During a bulk, cardio earns its place through cardiovascular health, appetite control, and work capacity, not through fat loss, so dose it low and keep it boring.

If you want a single default, the best cardio workout for muscle gain during a surplus is 25 minutes of incline walking twice a week, adjusted only when appetite or conditioning demands it.

Starting dose and how to progress it

Treat the first two weeks as a measurement block, then move one variable at a time.

• Start at two sessions: 20 to 30 minutes of incline walking or cycling on days that sit furthest from leg training.
• Add duration before frequency: push sessions toward 40 minutes before you add a fourth session.
• Keep intensity steady: bulking is the wrong time to introduce sprint intervals that leave your hamstrings sore for days.
• Watch the scale: if weight gain stalls on a fixed surplus, food is usually the variable to change first, not cardio.

Common Mistakes That Cost Muscle

Almost every avoidable problem comes from four habits rather than from cardio itself.

• Cardio before lifting: it costs working-set quality in the session that actually drives growth.
• Stacking hard intervals on leg day: sprint work right after squats adds soreness without adding fat loss.
• Treating cardio as a fat loss tool in a bulk: in a surplus the calorie target controls weight gain, not the treadmill.
• Jumping volume too fast: going from zero sessions to six in one week is the change most likely to flatten your lifts.

Pairing easy aerobic work with high-volume machine lifting is a common garage setup, and this 2 in 1 combo machine workouts guide shows how two training modes share one station without long changeovers.

How Should You Schedule Cardio Around Lifting Days?

Lift first, then do cardio, or separate the two by at least three hours. Doing cardio immediately before lifting is the worst arrangement for strength, and same-session pairing attenuates explosive strength more than split sessions do.^[4]

Getting that order right is most of what combining cardio with bodybuilding requires; the rest is keeping the aerobic dose small enough to recover from.

• Same session, right order: resistance work before endurance work produced a 6.91 percent greater change in lower-body dynamic strength than the reverse order.
• Minimum separation: when sessions were separated by at least three hours, the attenuation of explosive strength was no longer significant.
• Worst case: a hard cardio session immediately before lifting degrades the quality of every working set that follows.
• Rest days are not cardio days: if a rest day exists to protect recovery, keep it free of structured intervals.

One coach interview suggests capping most lifters at roughly two to three cardio sessions per week, favoring low-impact and low-eccentric modes, and separating them from resistance training whenever the schedule allows.

"In my personal practice, I typically don't have people do more than one, two, three cardio sessions per week. Certainly not more than one or two, maybe three HIIT sessions. I am trying to make sure that it's low impact, low eccentric action, and that it's separated from resistance training if possible."
Eric Helms, PhD, Exercise Scientist and Bodybuilding Coach, MASS Research Review, Dr. Eric Helms Answers: What's the Best Way to Combine Cardio and Weightlifting?

Can You Build Muscle With Smith Machine Work and Cardio in One Plan?

A Smith machine anchor handles the heavy work, and cardio shifts away from leg days. Keep the two separated by time or by day and the combo holds.

For a four- or five-day week, the best cardio workout for bodybuilders is short and low impact: 20 minutes of incline walking after an upper-body session.

Most garage setups run this pattern around a RitFit Buffalo Smith Machine home gym package, because a fixed bar path makes heavy squats and presses repeatable without a spotter. If you are still comparing frames, browse the full range of Smith machines before you commit to a footprint.

A four-day garage gym combo week

The split below keeps cardio on the days that sit furthest from the heaviest lower-body session.

• Day 1, lower strength: Smith machine squats and Romanian deadlifts, 4 sets of 6 to 8 reps, no cardio.
• Day 2, upper strength: Smith machine incline press and rows, 3 sets of 8 to 10 reps, then 20 minutes of incline walking.
• Day 3, off or easy: 30 minutes of easy cycling, kept below an effort of 5 out of 10.
• Day 4, lower volume: a 3 in 1 leg press and hack squat package for quad volume with less lower-back fatigue, no cardio after.
• Day 5, upper volume: accessories plus 15 minutes of kettlebell swings or sled pushes.

Keep the lifting sessions themselves progressive. These Smith machine chest workouts and this Smith machine back workout warm up routine give the upper half enough structure to keep adding load while cardio volume creeps up.

What Does a Weekly Cardio Plan Look Like During a Cut?

Start a cut with three weekly cardio sessions of 25 to 30 minutes, then add time before adding sessions. Weekly volume should rise only when fat loss stalls for two straight weeks, and it should fall when lifting performance drops.

• Week 1 to 2: three sessions of 25 minutes, low impact, placed after lifting or on non-lifting days.
• Week 3 to 4: extend each session to 35 minutes if weekly weight loss has stalled.
• Week 5 onward: add a fourth short session only after duration has been pushed to 40 minutes.
• Diet first: a modest calorie reduction protects training quality longer than a large cardio increase does.

Low-equipment conditioning keeps the cut flexible when you travel or train at home, and this beginner kettlebell workout guide covers the technique before you load heavier. A single pair of kettlebells covers swings and carries without taking up floor space.

How Do You Know Cardio Is Eating Your Gains?

Rising soreness, flat working weights, and worse sleep are the three clearest signs that cardio volume has outrun recovery. Pull volume back before you rewrite the lifting program.

• Soreness that never clears: legs still heavy 48 hours after a session that used to leave you fresh.
• Working weights that stall or slide: the same load feels heavier for two or three sessions in a row.
• Sleep and appetite changes: difficulty falling asleep or a sharp drop in appetite on a fixed surplus.
• Resting heart rate creep: a resting heart rate several beats above your normal baseline for a week or more.
• Stop conditions: joint pain that changes how you squat, or any sharp pain during cardio, means stop that mode and get it assessed rather than pushing through.

When two or more of these appear together, cut cardio volume by a third for one week and hold the lifting program constant, so you can see which variable caused the change.

FAQs About Best Cardio for Bodybuilding

Conclusion

The best cardio for bodybuilding is the cardio you recover from. Keep it low impact, keep it short, lift first or separate sessions by at least three hours, and let weekly volume grow only when fat loss actually stalls.

Pick one mode you can repeat in your garage, log sessions alongside your lifts, and change one variable at a time. For current offers on the hardware side of the plan, check the RitFit discount guide.

Disclaimer

This article provides general fitness education about cardio programming for physique-focused lifters and is not medical advice. Consult a qualified physician or licensed professional before starting or changing any training, cardio, or nutrition program, especially if you have a heart, joint, or metabolic condition.

References

1. Schumann M, Feuerbacher JF, Sünkeler M, et al. Compatibility of Concurrent Aerobic and Strength Training for Skeletal Muscle Size and Function: An Updated Systematic Review and Meta-Analysis. Sports Med. 2022;52(3):601-612. doi:10.1007/s40279-021-01587-7. PMCID: PMC8891239

2. Lundberg TR, Feuerbacher JF, Sünkeler M, Schumann M. The Effects of Concurrent Aerobic and Strength Training on Muscle Fiber Hypertrophy: A Systematic Review and Meta-Analysis. Sports Med. 2022;52(10):2391-2403. doi:10.1007/s40279-022-01688-x. PMCID: PMC9474354

3. Chen Y, Feng X, Huang L, Wang K, Mi J. Comparative efficacy of concurrent training types on lower limb strength and muscular hypertrophy: A systematic review and network meta-analysis. J Exerc Sci Fit. 2024;22(1):86-96. doi:10.1016/j.jesf.2023.12.005. PMCID: PMC10767279

4. Eddens L, van Someren K, Howatson G. The Role of Intra-Session Exercise Sequence in the Interference Effect: A Systematic Review with Meta-Analysis. Sports Med. 2018;48(1):177-188. doi:10.1007/s40279-017-0784-1. PMCID: PMC5752732