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Peak Power by jumping.
ply
plyojumps
Dropjump op sprongmat.
By tryouts find your optimal personal
and sportspecific groundcontacttime
for optimal training result.
   Plyometrics jump, (PLY)
    Purpose: measuring/testing/training the plyometric strength of legs.
    Output:    jump height, jump capacity, peak power, contacttime,
                     drop height, RSI  
Information Reactive Strength
    Reactive Strength Index