Contrary to popular belief, abs are probably the easiest body part to train when you’re short on time and low on equipment. All you need is a floor. The next time you’re in a hotel, or your gym is closed for renovations, whip this workout out, which trains the abs (upper and lower) and the deep core muscles in only 10 minutes.
SEE ALSO: 28 Days To Six-Pack Abs Workout Program
Quick Tip: Sliders create instability and recruit more muscle. Available at valslide.com, starting at $30.