5. During workouts, stick to the Bs.
When shaping up for her Las Vegas residency at Planet Hollywood, Britney Spears’s trainer Tony Martinez had her focus on what he calls the “Four Bs”: Basketball jump shots, Backwards walking, Balancing on one leg while doing medicine-ball slams, and Bicycling. But there’s a fifth “B” in Britney’s routine, and it stands for Basics. On Instagram, she’s posted push-ups, core work, bar curls, and squats — moves anyone can do.