Your trouble zones are toast with these lab-tested ab, butt, and thigh toners.
Bicycle Roll Up
What you'll need: a pair of 5- to 10-pound dumbbells
Targets abs and obliques
- Lie faceup with arms crossed, legs slightly bent, heels on floor.
- Curl up, then rotate torso to left as you simultaneously bring left knee in toward chest.
- Return to start.
- Do 18 reps, alternating sides. Do 3 sets total.