One thing to know about workouts with Anna Kaiser Training: You’ll sweat. A lot. Her method is easy on the joints, but tough in general. This summer, the personal trainer for the likes of Kelly Ripa, Sarah Jessica Parker, and Shakira hosted a retreat in East Hampton, and has an upcoming one in Martha’s Vineyard and another in New York City in October. The immersive experiences include two classes each day, and healthy dinners crafted by Kaiser and celebrity chef Tricia Williams. Plus it’s on the beach, so you’ll have plenty of downtime to recover.