Want to get fit fast? The science is, quite literally, shocking. Manduu Houston (3733 Westheimer Road), the latest fitness sensation in River Oaks, is the first FDA-cleared electrical muscle stimulation technology to offer an effective one-on-one workout in just 15 minutes. Slip into an electrode-laden suit for a low-impact customized routine, led by a personal trainer, while impulses flow through your muscles ($59 per session for 30 sessions). This year in Post Oak Central, TruFusion (1980 Post Oak Blvd.), a fitness franchise backed by former Yankees player Alex Rodriguez, debuts. Boasting a behemoth schedule of more than 240 classes a week, the studio offers hot Pilates, kettlebell, battle ropes, yoga, barre and more. Even A-Rod’s fiancee, sexy superstar Jennifer Lopez, has documented her TruFusion sweat sessions. The newly minted Life Time Greenway (1 City Club Drive) has everything you need in one stately package. As a Diamond Signature Club, the brand’s highest caliber, the 80,000-square-foot club houses an expansive aquatic center, rigorous group exercise classes, on-site nutrition consultations, LifeCafe and a full-service spa. Memberships start at $199 per month.