This segment uses optional light dumbbells; Smith and Madison use 3 lbs. The first half of the routine is performed standing and includes moves to target the core such as a Figure 8 and triangle side reach. The second half is performed on the floor, adding the weights for half rollback, a weighted cross crunch, and a one-armed weighted roll up. This was my favorite segment, as the addition of the weights felt like it made the moves more effective