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Stand holding a 5- to 8-pound dumbbell horizontally in front of your rib cage with both hands. Squat and hold for 2 seconds.
Jump up explosively, as if you're reaching over a volleyball net. At the same time, lift dumbbell overhead, arms extended. As you land, bring the weight back toward your rib cage. Do 12 to 15 reps. To modify, stand up explosively without allowing your feet to leave the floor.
Too easy? Try this: Travel a few inches forward each time you land -- this will force you to jump higher in order to propel yourself forward.