Take This Burpee Challenge!: Source: Thinkstock Burpees are already bad news (in a good, tone-every-inch-of-your-body way!), but if you're ready for even more of a challenge, variations on the dreaded move are favorites of elite CrossFitters everywhere.
Tabata Training Ideas: Ever run out of ideas at the gym? Mix and match these exercises to get a great total body Tabata workout. Max intensity for 20 seconds, then rest for 10 seconds for a total of 8 exercises in 4 minutes.