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.

Trainer Kurt Hester’s “Thursday Grind” workout strings together some of your least favorite bodyweight exercises for a grueling challenge that you can perform anywhere.

Before you start, decide whether you’re going to do 15, 20 or 25 reps of each exercise. Perform a dynamic warm-up, then complete the following circuit:

• Burpees
• V-Ups
• Push-Ups
• Squat
• Mountain Climber
• Lunge

For the Mountain Climber and Lunge, split the reps between your two legs (for example, if you’re doing 20 reps, complete 10 per leg). Repeat four times, resting two minutes between sets.

The Challenge

Complete 4 sets of the Thursday Grind workout.

How Do You STACK Up?

Rookie:  15 reps
Pro: 20 reps
All-Star: 25 reps

Ultimate Challenge: Once you can complete this workout at All-Star level, do six sets of 25 reps each.

How to Win a STACK T-Shirt

1. Complete the challenge by July 6
2. Follow STACK on Twitter (@stackmedia)
3. Tweet your results and include #STACKChallenge

Congratulations to Jacob Zalewski for winning a STACK T-shirt by reaching All-Star level in last week’s 500-Meter Row Challenge.

Get Better

Not an All-Star yet? Use these workouts to get better.

• 20-Minute “No Excuses” Navy SEAL Bodyweight Workout
• The Young Athlete’s Bodyweight Workout
• The 225-Rep Bodyweight Workout