This is one of the fastest ways to get fit, and doesn't require more than 15 minutes (even giving 5 for farting around) or any equipment. 1 Round is 2-3 minute

This is one of the fastest ways to get fit, and doesn't require more than 15 minutes (even giving 5 for farting around) or any equipment. 1 Round is 2-3 minutes * Burpees(pushup variation) x 30 seconds * Shadow box x 30 seconds -- This isn't rest. Treat it like a fight. Add kicks, knees, elbows, etc. * Rest 1 minute between rounds. Make rounds longer, try to beat your reps, or add a weighted vest if you really want to challenge yourself.