New research shows short bouts of high-intensity cardio done throughout the day work just as well as doing them all at once. Info here.
All you need is one dumbbell and a hefty amount of mental fortitude.
And it doesn't have to take hours. Here's why you need to get your heart and lungs working now.
These workout finishers do more than build work capacity; they build muscle too.
Apply the principles of Soviet depth-jump training to push-ups and kettlebell swings to build unreal explosiveness and strength.