Just starting a 4×4 run. It’s 4 minutes of walking then 4 minutes of running, repeated 4 times. I guess you could call it a 4x4x4.
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Just starting a 4×4 run. It’s 4 minutes of walking then 4 minutes of running, repeated 4 times. I guess you could call it a 4x4x4.
The Struggle 