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Crunch Time

From core to cardio, trim your waistline—and your exercise routine—with the most intense 35-minutes-and-under workouts.

Inside celeb workout hub Rise Nation

1. Basecamp Fitness
The new studio’s signature 35-minute class has a high-energy approach: one-minute on a bike and one-minute off doing a variety of full-body exercises. $30 per class, 8714 Santa Monica Blvd., West Hollywood, 269.352.2909

2. David Barton Gym
The amenity-rich gym’s 6-Pack Attack class targets every nook and cranny of your abdominals in 30 minute’s time. $101 for monthly membership, 1950 Century Park East, L.A., 310.789.1111 

3. Oak Fitness Club
The Beverly Hills studio’s Burn Series combines a balanced roundup of yoga, Pilates, core work and resistance training, all within a speedy 25 minutes. Talk about making good time! $20 per class, 9346 Civic Center Drive, Ste. 145, Beverly Hills, 310.205.9091

4. Rise Nation
This cult favorite—Emily Blunt and Matt Damon are fans—specializes in a killer 30-minute full-body cardio climb that burns 22.3 calories per minute over the standard 13.8 in other cardio studios. $26 per class, 613 N. La Cienega Blvd., West Hollywood, 424.343.0082

5. Sirens & Titans Fitness
If its name is any indication, powerful workouts come standard at this Westwood studio. In a 30-minute span, its FUBAR VersaClimber workout and small-group strength and conditioning classes pack a solid aerobic punch. $30 per class, 2311 Westwood Blvd., L.A., 310.307.0200