Our friends at Self [1] explaing how adding weights to this simple floor exercise gets you an even better butt lift.

Give your cheeks some attention — and give squats a rest — with this butt-sculpting move, the Weighted Donkey Kick, from Los Angeles-based trainer Astrid Swan [2].

The exercise is part of the Butt and Back Mega Burner [3] workout from the brand-new, seven-day Best Bodies Challenge [4]. Here's how to do it: start on all fours with hands under shoulders, knees below hips. Bend left leg to 90 degrees and place one weight (start with 3 to 5 lbs.) behind left knee. Squeeze left leg to hold weight in place and kick left leg up into the air, then bring knee under hips. That's one rep — watch Astrid demonstrate how to perform the exercise in the GIF below. Do as many reps as possible in 90 seconds; then switch sides.

Score the rest of the routine (plus six additional total-body sculpting and fat-burning workouts and recipes) here [5]. Anyone else thinking about their "before and after" belfies?

More from Self.com:

• The Quirky Solution to Work Stress [6]
• 11 Tips for Working Out With the Apple Watch [7]
• Score a Ballerina Bod [8]