Les Mills CORE Classes at Club Greenwood provide a great workout that focuses on your core muscles. CORE is perfect for participants of all ages and fitness levels. CORE utilizes resistance bands and weight plates along with body-weight exercises like crunches. Club Greenwood is happy to offer the Lone Tree, Centennial, Denver, Castle Rock, Cherry Hills, and Greenwood Village areas with CORE to help men and women put more variety in their workout routines.