Celebrity fitness trainer Luke Milton, 39, knows his client Khloe Kardashian, 36, has worked hard to get her toned body! Her intense workout includes an ab routine to get that toned tummy. “She works very hard on those high intensity, low interval training principles and it’s something that I always preach,” Luke told HollywoodLife EXCLUSIVELY at the Sweat into Spring Training Mate class powered by SOS Hydration and at Training Mate in Santa Monica on April 8.