The 4-Minute Situp Challenge
Attack your abs with this lightning-fast fitness test.
3 Lightning-Fast New Workouts
The majority of gains from exercise come in the first 20 to 30 minutes, and at the right intensity, they come within the first 10.
The Unbelievable 4-Minute Cardio Workout
In fewer minutes than it takes to make a sandwich for lunch, you can get a surprisingly good burn.