Pre-contest cardio for bodybuilders
For many bodybuilders, pre-contest cardio and strength training go off track just when they matter most. The diet is in place — fewer carbohydrates, minimal fat, more protein — but suddenly gym workouts involve light weights, short rest periods and some form of training every day. The result: you get lean, but your muscle mass has melted away along with the fat. Below are five specific rules to help you step on stage with the muscle mass that made you want to compete in the first place.
Why so many get pre-contest cardio wrong
A common belief is that you should increase your rep count and reduce your weights before a competition. In practice, this leads to muscle tissue loss and a slower metabolism — exactly the opposite of what you need during a cutting phase. As muscle fibers shrink, your physique looks smoother, and the weight you lose comes from the wrong source. The nutrition side is usually handled well: carbohydrate intake drops, dietary fat is kept to a minimum and protein portions increase. In the gym, however, questionable practices persist — light weights, shorter rest periods and some form of training every day. This combination tends to strip away quality muscle tissue rather than preserve it.
The principle is simple: the weight you lift sends your muscles a message that says, “you’re still needed.” During a strict diet, that message is vital. If your strength in the gym drops, you lose mass too — and that is a warning sign, not a coincidence.
Every bodybuilder knows that muscle growth and gains in mass come through progression — using compound exercises and increasing resistance gradually but consistently. The same logic works in reverse: if you suddenly start lifting light weights and increasing your reps, you signal to your body that it no longer needs that mass. Losing muscle tissue also slows your metabolism, which in turn makes burning fat harder and forces you to make your diet even stricter. You are now in a vicious cycle.
Maintaining your lifting weights and managing rest intervals
1) Keep your weights up. Your rep count can increase slightly, but going beyond 12 reps is not worthwhile — heavy resistance with low to moderate rep counts stimulates muscle growth and helps preserve mass. The rule: during the pre-contest period, you should be able to lift 85–90% of the weights you used during your mass-building phase. If your off-season bench press is 150 kg × 8 reps, you should be able to manage 127 kg (85%) to 135 kg (90%) for 7–8 reps before a competition. If your strength drops below that, you are losing quality muscle mass.
2) Shorten rest periods between sets. Shorter rest periods increase workout intensity and calorie burn while depleting muscle glycogen stores — shifting your metabolism toward using fat. A good starting point:
- Smaller muscles (biceps, triceps, abs, calves) — around 40 seconds of rest.
- Larger muscles (chest, back, quadriceps, hamstrings) — around 1 minute.
There are always exceptions: some people do better with 45–50 seconds for smaller muscles and 60–90 seconds for larger ones. Your guide is always the weight you can lift. If rest periods become so short that your weights drop below 85% of those used during your mass-building phase, increase your rest time again. There is no point relying on gym workouts alone to burn fat — that is primarily the job of nutrition and cardio. Strength training is there to maintain muscle mass and tone.
As a rule of thumb, the shorter the rest period, the more calories you burn during the workout and the greater the share of that energy supplied by fat stores. Since you are already in a calorie deficit while dieting, your body turns to fat to make up the shortfall. That is excellent for getting lean — but only as long as you maintain your lifting weights. Once your strength drops below 85% of your mass-building levels, the conclusion is clear: either your rest periods are too short and you are rushing, or your calorie deficit is too large. In either case, you are losing muscle. That is why the 40-second and 1-minute guidelines are starting points — from there, you need to keep adjusting based on your strength.
3) Alternate between cycles of short and long rest periods. You cannot get through the entire pre-contest period using only short rest periods — your lifting weights will drop and you will lose mass. Here is a specific example: if you lift 150 kg × 8 reps in the off-season with 2–3 minutes of rest, you may struggle to manage even 85–90% of that with shorter rest periods. A good approach is 2 consecutive weeks of short rest periods (30–60 seconds between sets), followed by 2 weeks of longer off-season rest periods (1.5–3 minutes). This approach maintains strength, helps prevent the overtraining that short rest periods are so prone to causing, and still delivers the calorie-burning effect.
High-intensity cardio in cycles
4) Add high-intensity cardio. If you do more than 4 × 40 minutes of cardio per week, testosterone levels drop significantly and cutting starts to work against you. The solution is to increase intensity, not duration.
I define high intensity as around 80% of maximum heart rate. In practice, this only works as interval training: go hard on a treadmill or stationary bike for 2–3 minutes (at 80% intensity), then spend 1–3 minutes cooling down — at a slower pace or with less resistance, allowing your heart rate to drop while remaining elevated. With this format, 20–25 minutes per session and 4–5 sessions per week are enough.
Why does this work better than steady-state cardio? The afterburn effect. Standard low- to moderate-intensity cardio keeps your metabolism elevated for about 30–45 minutes after a session. High-intensity cardio extends that to 60 minutes or longer, and you burn more calories during the session itself. A demanding diet and training routine inevitably slows your metabolism — high-intensity cardio gives it a boost that a slow, steady pace cannot.
Here is what that looks like in practice: spend 3 minutes on the treadmill at 80% intensity, and your heart rate climbs while the effort feels hard. Follow that with 2 minutes at an easier pace, during which your heart rate drops a little but remains well above its resting level — and that is what keeps the calorie burn going. Repeat 4–5 times, and your session is wrapped up in 25 minutes. Burning the same number of calories at a steady pace would have taken considerably longer, with a greater drop in testosterone.
5) Never train for more than three days in a row. The pre-contest period is already stressful: a high training load combined with cuts to calories, carbohydrates and fats puts your body into a severe deficit. Signs of overtraining are hard to spot while dieting because your attention is on “getting into contest shape.” Yet this is precisely when you lose muscle mass — along with a drop in your overall metabolic rate, testosterone and insulin-like growth factor levels.
A common mistake is to train for several days in a row, reluctant to take even a day off for fear that 1–2 rest days will compromise your condition. In reality, the opposite is true — pushing through day after day is exactly what leads to overtraining, which causes muscle loss, slows your metabolism and disrupts your hormonal balance. During a stressful period, complete rest days matter more than any extra workout.
The schedule proposed in the original article is 2 workouts + 1 rest day, training the whole body over a six-day period. Here is an alternative from the translator that many bodybuilders are willing to use in practice:
- STRENGTH TRAINING + CARDIO
- STRENGTH TRAINING
- CARDIO
- STRENGTH TRAINING
- STRENGTH TRAINING + CARDIO
- COMPLETE REST
- repeat the cycle
Another option is 3 workouts, 1 rest day, 1 workout, 1 rest day: train your upper body over three days, take one rest day, then train legs, take another rest day, and repeat the cycle.
Some bodybuilders train 5–6 days a week, working 1–2 body parts each day and taking only Sunday off. Even then, complete rest days are necessary — even a small amount of training every day negatively affects the hormones that help preserve muscle mass. Short 30–60-minute sessions do reduce the risk, but training every day over an extended period creates constant stress that will take its toll on muscle mass sooner or later. The solution is simple: even during the toughest pre-contest phase, your program must include complete rest days. How much time you can take away from training is an individual matter — but rest days must be part of the plan.
To sum up, pre-contest training is a balancing act. Keep the weights heavy, because they preserve muscle mass. Shorten rest periods, because this speeds up your metabolism and taps into your fat stores. Cycling between long and short rest periods keeps your strength levels stable. High-intensity cardio intervals deliver an afterburn effect without taking too much of a toll on testosterone. And complete rest days ensure that this demanding routine does not end in overtraining and muscle loss. The person who makes it to the stage is the one who can manage all five elements together — not the one who trains the most.
FAQ: pre-contest cardio
How much pre-contest cardio is too much?
More than 4 × 40-minute sessions per week starts to lower testosterone levels and uses up energy you need to preserve muscle mass. Opt for shorter, more intense sessions over long, steady ones.
How can I tell if I am losing muscle, not just fat?
Here is a simple test: if you can no longer lift at least 85% of your off-season weights in the gym for the same rep count, you are losing quality muscle mass. That is a signal to increase the weights, lengthen your rest periods or take one or two extra rest days.
Is HIIT suitable for every bodybuilder?
In principle, yes, but an introductory week at a lower intensity is sensible, especially if all your cardio during the previous off-season was steady-state. Always adjust the length and number of intervals according to your strength levels and how well recovered you feel, rather than the other way around — this is the only way to maintain both benefits in the long term.
Translated from the article “Pre-contest Training” — Chris Aceto.
Author: Janar Rückenberg
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