But totally worth it! For proof, try the workout below, created by Bec Donlan , fitness instructor and creator of Sweat With Bec . Grab a resistance band and get ready for the best beach workout of your life. (Trust, your booty will be FEELING it the next day.)

Time: 25 minutes

Equipment: Resistance band

Good for: Total-body

Instructions: Complete all the moves below, one after the other, for as many reps as indicated. Or, for a shorter routine, choose five exercises.

Standing Single-Leg Kickback

How to: Wrap a resistance band around the middle of your right foot, then grab the other end in your right hand. Stand up straight with your feet hip-width apart. Lift your left arm, bend your elbow, and place your hand behind your head. Slowly lower to the right side, giving in to the resistance band. Then return back to start. That's one rep. Complete 20 reps on each side.

This workout was shot at the W Hotel Costa Rica during one of their Fuel Weekends fitness retreats, where Bec Donlan was a featured instructor.