P90+ = Foot Platform (PEMF + Terahertz) + Revitaluxe Claw (Red Light • EMS • Heat • Percussion) Why shoulders get stuck Your rotator cuff  is a group of four muscles/tendons that hold the ball-and-socket joint steady so you can lift, reach, and rotate your arm. When those tendons get irritated or frayed, you feel a dull ache that often worsens at night  and with overhead reach. If inflammation lingers, the joint capsule can tighten and thicken—what doctors call adhesive capsu