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Answer: Once you resume your routine, you should see results in three to four weeks. Research shows that it takes twice as long to lose strength as to gain it, says Wayne Westcott, Ph.D., fitness research director at the South Shore YMCA in Quincy, Massachusetts.
One study found that with two months of weight training, participants had gained 47 percent more strength; after two months of inactivity, they'd lost only 23 percent. Get motivated by setting a new fitness goal, and start at about half the difficulty level of where you left off (say, doing biceps curls with a 5-pound weight rather than a 10-pound one).
Originally published in Fitness magazine.