Exercise Categories — Structural, Supplementary, Body-Part

An exercise can be classified as one of three types (Fleck & Kraemer, 1997):

1. Body part exercise (isolated) — usually involves the isolation of a single muscle (e.g. bicep curl, standing calf). Also referred to as an isolation exercise.
2. Supplementary exercise — a good substitute for a structural exercise. For instance, if a client cannot perform the squat movement properly, they should use the leg press machine instead.
3. Structural exercise (compound) — usually involves the use of many muscles to produce a movement (e.g. squat, bench press). Also called a major or compound exercise.

These categories drive both exercise selection and exercise order. A bodybuilding quadriceps routine illustrates the categories in sequence: a structural exercise (squats), then a supplementary exercise (45-degree leg press), then a body-part exercise (leg extension).

• Three categories: structural (compound), supplementary (substitute), body-part (isolation).
• Structural = many muscles / multi-joint (squat, bench press).
• Body-part = isolates one muscle (bicep curl, standing calf).
• Supplementary = substitute for a structural exercise (leg press for squat).

• exercise-selection — choosing exercises across these categories.
• exercise-order — ordering structural → supplementary → body-part.
• pre-exhaustion — sequences a body-part (isolation) exercise before a structural one.