This is a means of physical culture that has fallen by the wayside over the years, much like hand balancing. Muscle control involves flexing and relaxing
Muscle Control
What Causes Alien Gains? Unsurprisingly, It's Not Muscle Control
Muscle Notes. - ppt download
Learn to feel and control your long hip muscles
I Can't Go – Explaining Muscle Control and Chronic…
The Importance Of Good Posture & Muscle Control For Exercise
Original 1940s Book Muscle Control By Maxick – Mullard Antiques and Collectibles
Muscle Control by Walt Baptiste
Strongman Profile: Maxick Teaches Us the Lost Art of Muscle Control - Breaking Muscle
Redcord, Suspension Exercises
I found IRL Julius's Muscle Control : r/Kengan_Ashura
Sensors, Free Full-Text
Nervous System Control of Muscle Tension