The fitness world has embraced a new champion in core training, and traditional sit-ups have taken a backseat. The plank, ...

The Stakt mat, a high-quality foldable yoga mat, came along just as at-home workouts were taking off. Shark Tank gave the founders a chance at big advancement.

The triceps are the first to give out during push-ups, and mine were trembling toward the end of the 70 reps each day. My ...