20-Minute Arm & Core Circuit
For interval workouts I use this very simple (and free!) Interval Timer app that allows you to set your work intervals, rest intervals, and the number of rounds. A buzzer (or whatever…
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Hold That Post Circuit
The most common types of muscle contractions you’ll see in any gym are concentric (muscle shortening, i.e. pulling the weight toward you in a bicep curl) and eccentric (muscle lengthening, i.e. lowering…
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