Popsugar Fitness Celebrity Fitness Heidi Klum Playing Tennis Heidi Klum Will Inspire You to Start Your Fitness Resolution Now December 30, 2014 by Aemilia Madden View On One Page Photo 3 of 4 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 3 Hilary Duff Hilary stayed motivated during the holidays, making time for the gym the day after Christmas. Previous Next Start Slideshow Gwen StefaniHeidi KlumHilary DuffCelebrity FitnessElliot Page