Aniston likes to keep her arms lean, not bulked up. Her secret? Before doing her muscle-building yoga routine, she hits the elliptical machine to burn fat and calories.
Ballet barre classes at N.Y.C.'s Physique 57 give Ripa "tremendous muscle tone," says gym cofounder Tanya Becker.
The singer's strength-training sessions with AJ Johnson include 35-50 reps per exercise.
The Spice Girl has tried Pilates—but otherwise "doesn't exercise at all," a pal says.
Six days a week, she does an hour of strength work and 40 minutes of dance aerobics with trainer Tracy Anderson.
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SARAH JESSICA PARKER
For Sex and the City
, she worked with a trainer and did yoga "to put muscle on," says a source. "She wanted to tone up."