The moves call for three-, five-, and 10-pound dumbbells, but you can also work with whatever weights you have available. Do this sequence two to three times a week. Start with one set of each move. As you get stronger, do up to four rounds in a circuit. After six weeks you can expect to see improvements in strength, muscle tone, and endurance.

The moves call for three-, five-, and 10-pound dumbbells, but you can also work with whatever weights you have available. Do this sequence two to three times a week. Start with one set of each move. As you get stronger, do up to four rounds in a circuit. After six weeks you can expect to see improvements in strength, muscle tone, and endurance.

THE MATRIX Grab a five- to 10-pound medicine ball (or dumbbell) and kneel on the floor with your knees hip-width apart. Keep your torso upright and hold the ball against your abs (a). Slowly lean back as far as possible, keeping your knees planted (b). Hold the reclined position for three seconds, then use your core to slowly come up to the starting position. Do 12 to 15 reps.

The moves call for three-, five-, and 10-pound dumbbells, but you can also work with whatever weights you have available. Do this sequence two to three times a week. Start with one set of each move. As you get stronger, do up to four rounds in a circuit. After six weeks you can expect to see improvements in strength, muscle tone, and endurance.