Two minutes of cardio (your choice), samson stretch, CFWU x 3 (x 2 if in first two weeks of WODs)
If you have access to a rower, row 1500 meters. If you don’t, run 1 mile.
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Before anyone complains, remember that CrossFit trains with constantly varied functional movements. This means that life will probably throw things at you when you least want or expect them.