The FIRM: Total Body Toner

A diverse sequence of all-dumbbell body-sculpting (even the floor work uses weights). For maximum effectiveness, nearly every fast-paced exercise works multiple muscles at once. Allie Del Rio keeps it interesting with non-stop movement variations she's endlessly changing angles, tempos, body positions, weight levels and range of motion. She makes the transitions smooth and natural by always starting with a basic routine, then gradually adding in the modifications.

• health and fitness