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For example some people in prison complain than they have to resort to push-ups in order to keep in shape, if they don't have access to gym equipment

I guess I'm trying to understand why do some tools make it easier for us to gain strength vs just using our body to gain the same amount of strength?

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closed as primarily opinion-based by Freakyuser, Baarn, FredrikD, Lego Stormtroopr, Kate Oct 14 '13 at 16:30

Many good questions generate some degree of opinion based on expert experience, but answers to this question will tend to be almost entirely based on opinions, rather than facts, references, or specific expertise.If this question can be reworded to fit the rules in the help center, please edit the question.

External tools provide a simple method to apply greater resistance.

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