Every week, a new STACK Challenge gives you an opportunity to test your athletic ability and win a STACK T-shirt. Take the challenge and enter to win by tweeting your results with #STACKChallenge.

This week’s STACK Challenge is an equipment-free lower-body workout that you can perform anywhere. It’s perfect for days when you can’t make it to the gym or want to train outdoors.

Complete the Super Leg Circuit by performing the exercises listed below in less than 90 seconds. Repeat the circuit five times while maintaining perfect form.

• 20 Bodyweight Squats
• 20 Squat Jumps
• 20 Alternating Lunges (10 each leg)
• 20 Split Squat Jumps (10 each leg)
• 10 Alternating Step-Ups (5 each leg)

The Challenge

Complete the circuit in 90 seconds or less. Rest for two minutes, then repeat until you’ve completed five rounds.

How Do You STACK Up?

Rookie: 1-2
Pro: 3-4
All-Star: 5

How to Win a STACK T-Shirt

1. Complete the Challenge by May 4
2. Follow STACK on Twitter (@stackmedia)
3. Tweet your results and include #STACKChallenge

Congratulations to @CoachGioCSCS, who earned a STACK T-Shirt for completing all 10 rounds of the 5-Minute Treadmill Challenge!

Get Better

Use this week’s STACK Challenge to benchmark your lower-body strength and endurance.  If you can’t complete all five sets, perform the workout once a week with fewer reps to get better. Start by doing all five sets but cutting the reps in half, then add a rep or two each week until you’re doing the full workout.