A prime example of this fitness savvy is his nighttime ab routine, which consists of one exercise, one weight (or not), and takes less than 10 minutes to complete. If you need proof of concept ...

This trainer-led workout targets your deep core muscles and abs, and is all done standing up. You just need space to move your body and the kettlebell around and you're good to go. The routine ...

And if you want increase the intensity of your mid-section sessions, consider adding in some of the best ab exercises with dumbbells as well.