Squat with crossover step: "With weight on shoulders— using Barbells, dumbbells, sandbags, etc.—do a squat, then do a crossover step to the right. Squat again, do a crossover step to the left, then ...

Grab a pair of dumbbells and stand to the right of a step. Cross your right foot in front of your body and place it flat on the step. Press down with your right foot to push yourself up until both ...

ABC News' own Dan Childs takes on an exercise challenge. — -- Some experts call it "hitting the wall," others call it "the bonk": Either way, it's the all-around unpleasant situation when an ...