Place your hands lightly on the bed for balance if needed. Lower one leg toward the mattress with control. Stop just before ...

The plank is one of the most effective core (abdominal, back and stabilizing muscles) exercises out there. Master the plank and you can build core endurance and strength. If a regular plank wasn't fun ...

At full extension, the right leg should be 3 or 4 inches off the ground. 3 Slowly lift the right knee back up toward the chest. As you do this, slowly extend the left leg downward. 4 Steps 2 and 3 ...