Volume load
Also known as: Tonnage
Volume load is a strength-training workload measure calculated by multiplying sets by repetitions by the external load used. Three sets of eight reps with 80 kg produce a volume load of 1,920 kg. The result is sometimes called tonnage even when it is reported in pounds or does not literally reach a ton.
The calculation can summarize one set, one exercise, a workout, or a longer period. For changing loads, calculate each set separately and add the results: eight reps at 80 kg plus eight at 75 kg equals 1,240 kg for those two sets. This is more accurate than multiplying the total reps by only the heaviest or average load without defining the method.
Volume load is one way to describe training volume, but it is not a direct measure of muscle stimulus, fatigue, or energy expenditure. It does not account for range of motion, technique, repetition tempo, proximity to failure, or exercise mechanics. Ten repetitions of a 100 kg squat and ten repetitions of a 100 kg calf raise generate the same arithmetic total but are not equivalent training tasks.
Comparisons also become difficult with machines whose labeled stacks have different pulley ratios, with resistance bands whose tension changes through the movement, and with bodyweight or assisted exercises. A push-up cannot be represented accurately by multiplying reps by full body mass, because only part of that mass is supported by the arms and the proportion changes with setup. Unilateral exercises require a consistent convention about whether load and repetitions are counted per side or in total.
Volume load is most useful for progress tracking within the same exercise under similar conditions. An increase can show that more external work was completed, but it should be interpreted alongside load, reps, set count, movement quality, and effort. Raising tonnage by adding many easy repetitions is not automatically the same improvement as lifting a heavier load or performing more high-quality working sets.