Speaking of which, I hurt my left knee somewhat last week playing basketball and need to take it easy on it. I need to find cardio equip at the gym that will allow me to rest my knee. I have not seen a rowing machine there but I have seen a sort of pedal looking thing that you pump with your arms. How would you guys rate the 30 minute workouts doing circuits as a decent cardio replacement for cycling, treadmill, or stairmaster?
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