I was looking into improving my hand speed, and a girl that used to be a trainer recommended that on my cardio only days that I add this machine (sorry don't know what it's called). The machine is like an exercise bike but you use your arms on the pedals. Do you guys think this machine is actually beneficial as far as hand speed goes? I don't mind adding it anyway, cause I can mix up my cardio more, but................it's kinda weird cause I only see really old people on it.