What happens when you take an already-challenging core exercise and add weight to it? Gains. Check it out:

Hollow Body Hold with Dumbbell Reach

  1. Lay on the floor with weight on your lower back and glutes.
  2. Simultaneously lift both your legs and shoulders off the ground. This by itself will engage your abs.
  3. Hold a dumbbell in both hands under your chin.
  4. Slowly reach the dumbbell behind your head. This pushes the weight further from your center of gravity and forces your abs to work harder.
  5. Pull the dumbbell back under your chin. This will feel similar to an ab wheel rollout.

Do 3-4 sets of 8-10 reps.

Related: The Core Exercise You've Never Tried

Related: The Full-Body Dumbbell Workout Program 2