Body tempering is a form of passive myofascial release used amongst athletes, physical therapists and trainers, and is a hands-on application of pressure to the muscles using a heavy steel roller. There is little to no evidence in the literature showing its effectiveness for performance or injury rehabilitation. PURPOSE: To determine any acute differences between passive myofascial release with a steel roller (PMfR) and a dynamic warm up (DWU) on lower body anaerobic muscular endurance. METHODS: Ten participants, 5 females (23.0 ±1.3 years; 75.5±5.2 kg; 159.8±1.2 cm) and 5 males (24.6 ±2.1 years; 82.5±3.8 kg; 168.0±2.8 cm), were asked to participate in this study. The first session was a familiarization session to test leg press one repetition maximum (214.3±32.7 kg). The following two randomized sessions, separated by at least 72 hours, began with a five-minute cycle ergometer warm-up at 1.0kP for females and 1.5kP for males at 50RPM. Subjects performed a PMfR protocol or a lower body DWU prior to beginning a leg press specific warm-up. The PMfR protocol involved rolling the quadriceps and hamstrings for approximately two minutes each. The DWU protocol involved ten repetitions of six exercises (inchworms, hip-bridges, side-lying hip abduction, mountain climbers, lateral lunges, and squat jumps). Subjects then performed a set of ten repetitions at 25% and 50% and six repetitions at 75%. After a three-minute rest period, subjects performed repetitions to failure at 85%. One-way Analysis of Variance (ANOVA) was used to determine significant differences in repetitions. RESULTS: Repetitions were significantly (p<0.002) different between protocols. Subjects performed more repetitions following the PMfR (25.4 ±7.0 repetitions) condition than the DWU condition (16.8 ±4.5 repetitions). CONCLUSIONS: The current pilot data demonstrates that PMfR may be an effective warm up modality in combination with a specific warm up to assist in lower body anaerobic endurance. Precaution must be taken with the current data, as some subjects had as many 40 repetitions at 85%, which is not congruent with that percent 1RM. The current DWU protocol seems to have possibly decreased performance due to fatigue. Further studies should use a multi-set approach with a resistance trained population approach to better determine its efficacy.