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Body readiness is clever because over-exercising can be a problem and lead to injuries down the road -- and under-exercising leads to being out of shape, this provides proof to the user what their body is ready for or what it needs, taking the guesswork out of how a user is thinking about how their body is doing. It uses the user's own data to come up with a score instead of comparing to some vague and sometimes inaccurate set of information.