Own a TRX?! Try this four exercise circuit for 3 rounds at either a 40/20 timed format (that's 40 secs of exercise and 20 secs of rest) or a 60/30 timed format (that's 60 secs of exercise and 30 secs of rest) continuously until you’ve completed all three rounds. https://www.youtube.com/watch?v=u1KBXrXMfDg)











