12. Crossfit
When we think of CrossFit, probably the gym comes to our mind along with a lot of tools. At home and without these tools, CrossFit is a little 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