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You’ll Need:a resistance band and a chair or bench 1 to 2 feet high.

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For some moves, you may want a yoga mat or lightly padded surface.

Do:this 8-move circuit 3 times, twice a week, on your days off from running.

Headband, $20 for six;Adidas.com.

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Step right foot back into a lunge, keeping shoulders over hips (as shown).

Push off right foot to stand on left leg with right knee bent 90 degrees at hip level.

Return to start for 1 rep; repeat on opposite side.

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Do 15 reps per side.

Bend elbows 90 degrees.

Lift hips to form a straight line from knees to shoulders (as shown).

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Swing arms as you press through left heel to stand on chair and drive right knee to hip level.

Return to start for 1 rep. Do 15 reps. Switch sides; repeat.

Oomph Squat

Works: legs

Stand with feet hip-width apart, a resistance band around lower thighs.

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Clasp hands in front of chest.

Keep back straight as you squat, opening legs against band (as shown).

Squeeze left glute and bend elbows to do a push-up (as shown).

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Return to start for 1 rep. Do 6 reps. Switch sides; repeat.

Knee Sit-Up

Works: core

Lie faceup with arms extended overhead, legs straight.

Return to start for 1 rep. Do 15 reps.

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