Tighten your abs to drive your lower back into the ground. Do a sprinter situp, contracting your abs then bringing right elbow to left knee; your right leg stays straight. Do 1 rep. After that one ...

Because your abs, obliques, and lower back muscles ... You'll do that with Samuel's Gator Roll to Sprinter Situp Countup, a devilish core burner that's over in 5 or 6 minutes and leaves your ...

We did everything from 300-meter repeats (every sprinter's kryptonite ... and I think we think of it in this way of 'I want these great abs.' But it's so much bigger than that," Felix told ...

including standard all-wheel disc brakes with ABS, and stability control. Another plus is the fact that the Sprinter actually handles, a feat long past the abilities of the Cargo Van. Almost no ...