12. Crossfit
When we think of CrossFit, the gym probably comes to mind along with many tools. At home and without these tools, CrossFit is a bit more challenging, but not impossible. Let me give you an example of a good core workout:
Complete 5 rounds of:
Ten sit-ups
Five push-ups
45-second plank
Ten push-ups
60-second plank
Fifteen sit-ups
Rest 60 seconds between rounds
[mashshare]
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