Targets: Abs and obliques
Kristin says: "From years of wearing five-inch heels, I have instability in my lower back. This move helps strengthen that area."
- Lie faceup on floor, legs extended with toes pointed, right leg crossed over left at ankles.
- Place hands lightly behind head, elbows bent out to sides, and pull in abs as you crunch up.
- Do 10 reps. Switch legs (cross left leg over right) and repeat.