This 2-day core program was developed from a 2019 research study published in the Journal of Sports Science Medicine. The research looked at the efficacy of foam rolling and a core strengthening program on different athletic and health outcomes. The results from the original program, based on 2 weekly sessions for 8-weeks, concluded the following: 1. Eight weeks of core-stability training two times per week improved dorsal trunk strength with no changes in a foam rolling group or the control. 2. Hamstring flexibility was improved both by an eight-week core-strength and foam rolling training intervention. In this Jefit core program, the first four-weeks use less intensity and overall time and includes 5 core exercises. In weeks 5-8, the focus is on similar core movements with longer hold times, slight progressions and about a 2-minute longer workout session. Jefit combined the program into one four-week program to make things easier. Good luck & Stay Strong, MICHAEL WOOD, CSCS Jefit Team