The specific aims of this study are to: * describe how many heel raises and side hops TG athletes of various ages can perform and how far they can jump, one leg at a time. * examine how calf muscle endurance and hop performance are related to the risk of new injuries in the foot, ankle, and lower leg in TG athletes. The investigators hypothesise that atletes with superior performance in the tests for muscular endurance and hop performance will report fewer injuries during the follow up period.
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New injury
Timeframe: Within six months after baseline testing.