Alpha Progression
Training load
Also known as: Load
Training load is the demand imposed by a workout, exercise, or period of training. It is an umbrella concept rather than one universal number. In resistance training, "load" is also used more narrowly for the external resistance being lifted, so the intended meaning and unit should always be stated.
External load describes the work prescribed or completed. Relevant resistance-training measures can include kilograms on the implement, repetitions, working sets, movement distance, and repetition velocity; the exercise performed gives those numbers necessary context. Volume load—often calculated as sets × repetitions × weight—is one external metric, but it does not capture range of motion, exercise difficulty, proximity to failure, or which muscles received the demand. Comparing tonnage across unlike exercises can therefore be misleading.
Internal load describes the person's response to that external work. Examples include session RPE, set effort, heart rate in suitable activities, and other physiological or perceptual responses. The same external session can create different internal loads in two people or in the same person on different days. Sleep, nutrition, illness, prior training, and fitness can all contribute to that difference. A consensus statement on athlete-load monitoring distinguishes internal and external load and recommends interpreting monitoring measures within their specific context rather than searching for one universally superior metric.
Training load is related to, but not interchangeable with, training volume or intensity. Volume describes how much work is performed; intensity often describes resistance relative to maximal strength; load can encompass these prescription variables and the response they produce. For example, three sets of five at 80% 1RM and three sets of ten at 60% 1RM differ in intensity, repetitions, volume load, effort, and likely fatigue. Calling one session simply "more load" hides those distinctions.
Useful load tracking starts with the question being answered. Weight and repetitions may be enough for progression within one exercise, while total sets per muscle group may better describe program volume. Session RPE may add information about overall demand. More data is not automatically more accurate: consistent definitions, comparable exercises, and trends across several sessions are usually more informative than a single workload score.
