Accommodating resistance exercise machines


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The externally-applied force can either vary across the whole joint angle range of motion, or it can remain constant.

In the gym, it is actually quite rare for an externally-applied force to remain completely constant during an exercise, as we will see shortly.

The weight on the bar is the same wherever you measure it.

However, the externally-applied force is not constant, because this force is not solely attributable to weight, but equals .

External load types include pneumatic resistance, elastic resistance, weights (including free weights, chains, and machines), and dynamometers (which use magnets).