AUTONOMY AND VARIATION IN HIGH‐INTENSITY INTERVAL TRAINING: IMPACTS ON POST‐EXERCISE ENJOYMENT, SELF‐EFFICACY, AND INTENTION: 435 Board #251 May 27 10:30 AM ‐ 12:00 PM. (July 2020) - Mastrofini, Gianna F.; Collins, Robert P.; Rosa, Jorge A.; Sipos, Katherine M.; Waddell, Brian; Kilpatrick, Marcus W.