Compound exerciseMulti-joint exercise
An exercise that moves multiple joints and trains several muscles at once.
A compound exercise moves more than one joint and recruits several muscle groups at once: squats, deadlifts, presses, rows, pull-ups, lunges. Isolation exercises, by contrast, move a single joint and target one muscle.
They are the backbone of nearly every sensible programme because of efficiency. They train a great deal of tissue per set, allow heavy loads, develop coordination between muscles that have to work together anyway, and cover the whole body in a handful of movements.
They also produce most of the strength that transfers to life outside the gym, since standing up, lifting something off the floor and pushing a heavy door are all multi-joint tasks.
Their limitation is distribution. Load is shared according to leverage, limb proportions and technique rather than according to what you want trained, so a given muscle can be a minor contributor in every big lift you do. That is the argument for isolation work rather than an argument against compounds.
They cost more to recover from. A heavy squat session taxes the whole system in a way that leg extensions do not, which matters when planning frequency and when training in a deficit.
Technique carries more weight here too. The greater the load and the more joints involved, the more a small positioning error matters, which is why these lifts reward coaching and patient progression more than machines do.
In practice, build each session around one or two compounds, add isolation for the muscles your structure under-trains, and count both towards weekly hard sets with our training volume calculator.