Strength HIIT Workout Videos That'll Push You to the Limit

Sure, lifting weights with correct form often means taking it a little slower. (Sometimes, that even means risking your endorphin rush.) However, that's not always the case. This 5x5 HIIT strength workout video from all-star trainer Jen Widerstrom (creator of the 40-Day Crush-Your-Goals Challenge) is proof. The genius thing here is that, during each strength interval, you perform the move slowly for the first 30 seconds, then crank the speed for the last 30 seconds, once your body is primed for the movement. The result? A 25-minute strength workout that actually gets you out of breath.

Get the full workout and instructions: This 25-Minute Cardio Workout Video Proves Strength Training Doesn't Have to Be Slow​