【10 BACKREST LEVELS · -35° TO 80°】 Adjust the backrest across 10 levels from -35° decline to 80° upright incline, covering flat, incline, and decline in between. 【MULTI-FUNCTION LEG DEVELOPER & SIT-UP SWITCH】 The detachable leg developer trains both quads (leg extension) and hamstrings (leg curl), and one ring pin switches to sit-up mode in seconds.