Workout Description

Why This Workout Is Hard

Ring Muscle-Ups are one of CrossFit's highest-skill gymnastics movements, requiring significant shoulder strength, coordination, and technique. The limiting factor here is entirely skill-based — many average CrossFitters simply cannot perform an RMU at all. For those who can, 4 reps with no time pressure is relatively manageable. The Hard rating reflects the skill barrier that will force the majority of average athletes to scale.

Training Focus

This workout develops the following fitness attributes:

• Strength (7/10): Ring muscle-ups demand high relative upper body strength through the pull, transition, and push-out phases. Supporting bodyweight in the false grip and ring support position is genuinely demanding.
• Flexibility (7/10): The ring muscle-up requires significant shoulder mobility for the deep false grip, the turnover transition, and the support position. Wrist, shoulder, and thoracic range of motion are all meaningfully challenged.
• Power (6/10): The explosive hip drive and aggressive lat pull required in the kipping version demand real power output. Even strict variations require a forceful, explosive transition through the rings.
• Endurance (1/10): Four ring muscle-ups impose virtually no cardiovascular demand. The set is completed in seconds with minimal aerobic engagement, representing pure skill and strength work with full recovery.
• Stamina (1/10): Only four repetitions provide essentially zero muscular endurance stimulus. This is a max-effort skill task, not a sustained output challenge. Volume is far too low to tax stamina.
• Speed (1/10): With only four reps and no prescribed time domain, speed and cycling rate are irrelevant. Rest between reps is expected, and there is no incentive to sprint or cycle quickly.

Movements

• Ring Muscle-Up

Modality Profile

Ring Muscle-Up is a single bodyweight gymnastics movement. With only one movement and it falling entirely under the Gymnastics modality, the breakdown is 100% Gymnastics.