It's time to take stock of your progress on our five-month shape-up program, and there's likely good news and bad. The good: We bet your abs, legs, and butt are firmer, your upper body is stronger and more sculpted, and you're leaner all over. The bad: You may have to shell out some cash for a new wardrobe! Hold off on the shopping spree, though, because there are more confidence-boosting body changes on the horizon. This month's plan will get you that much closer to an angst-free bikini debut; it will even help you late starters who still have a little shape shifting to do before summer. So get moving, build some momentum, and you'll slip into your suit with plenty of time to spare.

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STRENGTH: SCULPT FROM HEAD TO TOE
How it works Do this strength plan, designed by trainer and Shape contributing editor Lisa Wheeler, two or three times a week. You'll need a stability ball and a set of 5- to 8-pound weights.
Warm up with at least five minutes of easy cardio, then do two or three sets of each move, resting up to 30 seconds in between.


THIS MONTH'S BIKINI CARDIO PLAN
How it works: Five or six times a week, do one of these routines using any type of cardio. Always give yourself at least one day off each week to recover.

ENDURANCE BUILDER
Spend at least 45 minutes at moderate intensity (you should be able to maintain a conversation).

INTERVAL CALORIE BURNER
0-10 Warm up for five minutes. Spend the next three minutes at moderate intensity, then finish up the last two minutes at somewhat hard intensity (you're breathing heavily).
10-10:30 Increase to a hard intensity.
10:30-12 Return to a moderate level.
12-12:45 Go hard again.
12:45-14 Return to a moderate intensity to recover.
14-15 Go hard again.
15-16 Return to a moderate intensity to recover.
16-26 Repeat minutes 14-16 five times.
26-30 Cool down at an easy intensity.