One of the many bodybuilding concepts that weight lifters must contemplate when compiling an effective workout plan is rest between sets, with some believing that brief rest periods provide a greater amount of muscle overload, leading to larger muscle gains. This ideology is based on the overall fatigue experienced when participating in a weight training workout with brief rest between workout sets, as the assumption is, if such a workout is more challenging physically, the muscle gains must therefore be superior compared with longer rest between sets.

The problem with this theory is that the fatigue experienced when rest periods between weight training sets are reduced does not stem from greater overload to muscles, but rather surfaces due to stimulation of the cardiovascular system, where the heart is pumping much faster to support the continual workload, similar to a heavy jogging workout. As a result, the amount of weight used during workout sets declines dramatically during brief rest periods, and this actually reduces total overload, hampering muscle growth. The weight training workout plan with short rest periods between sets may feel far more intense because of significant cardiovascular fatigue, but this should not be confused with an effective muscle building workout plan.

The error made by numerous bodybuilders is to create a hybrid between their cardiovascular and weight training workout sessions, feeling that this approach is sufficient in stimulating both muscle gain and fat loss. Yet, two variables are neglected in constructing this flawed idea, as weight used during each set is an important concept in producing the largest level of muscle gain, and complete mental focus during each set is also critical in promoting the greatest level of intensity. When rest periods between workout sets are reduced to extremely low levels, the mind often experiences fatigue due to the lack of a recovery period between sets, and develops a nagging tendency to put forth less effort during the weight training set itself. This, in combination with the considerable physical fatigue that results from moving quickly between weight training sets, causes the muscle to lift less overall weight than could be possible if rest periods were lengthened to a more reasonable level, as the body and mind do not have sufficient opportunity to recover sufficiently for the highest level of output throughout each set.

Extended rest periods between sets offer an emotional advantage for many, as feeling aerobically fresh throughout the weight training workout allows a bodybuilder to provide undivided mental attention upon each rep, without a feeling of overall fatigue that negatively impacts motivation. Yet, there are certain bodybuilders who either due to their work schedules or personal commitments are unable to devote more than a brief period to weight lifting sessions, and therefore need to maintain the shortest possible rest periods in order to target as many muscle groups as possible during their limited allotted workout time. In such a situation, extremely short rest periods between weight training sets are acceptable, as doing so is far superior to avoiding exercises, abandoning training for certain muscle groups, or training body parts on a less frequent basis.

Certain bodybuilders dislike extending rest between sets, as they feel far more capable of completing a weight training workout session with maximum focus when they avoid idle time, therefore, in such a scenario, shorter rest periods are acceptable, as making a weight training session realistic to continually pursue is one of the most vital factors leading to significant muscle gain, and if extending rest periods causes frustration, then reducing rest to the maximum time frame that feels tolerable is an acceptable practice. But for the bodybuilder who wishes to achieve the greatest amount of muscle building, and has the time and emotional commitment to extend rest between sets sufficiently so that a weight training workout moves away from a cardiovascular emphasis towards a dedicated muscle building focus, then this is a superior tactic to employ.

Remember that cardiovascular workout sessions are aimed at enhancing heart health and improving metabolism for faster fat burning, but they are not intended to produce significant muscle mass, and thus the best environment for muscle gains is one where the weight training workout session does not stimulate the cardiovascular system in any noticeable way, as crossing such a threshold can greatly limit future muscle growth.