Stand with your feet just wider than shoulder-width apart, with your toes pointed slightly out to the side. Squeeze your shoulder blades, abs, and glutes to create full-body tension. Keep your gaze ...

or as a means to challenge your legs during bodyweight-only workouts by programming with high volume (just ask anyone who has completed the Murph WOD how easy it is to finish 300 air squats).

Goblet squats are air squats performed with the addition of a dumbbell, kettlebell, medicine ball, or anything else that's heavy and compact. "Goblet squats require you to hold the weight in front ...