Intrinsics versus extrinsics
The long muscles in the forearm move the fingers; the small ones inside the hand shape and stabilise them. The small ones are almost never trained.
MoPro
Trainer's Eye
The small muscles inside the hand — the ones that shape every grip and that nobody trains.
The long muscles in the forearm move the fingers; the small ones inside the hand shape and stabilise them. The small ones are almost never trained.
The lumbricals straighten the fingers while the knuckles stay bent — the position used in almost every grip on a handle.
Touching the thumb to each fingertip and to the base of the little finger is the range that opens jars and holds a pen.
Three couplets · two rounds · twelve minutes · hands that hold on
Hand free of the table; draw the biggest slow circle the wrist allows, both directions.
Easier smaller circles · Harder slower and bigger
Palms together in front, then backs of the hands together; press gently and hold.
Easier smaller range · Harder hold longer
Spread the fingers as wide as they go, then close them tight together — count clean pairs.
Easier smaller range · Harder hold two seconds
Knuckles bent, fingers straight, like a tabletop; hold the shape without the tips curling.
Easier smaller bend · Harder hold longer
Touch the thumb to each fingertip in turn, then back — count complete rounds.
Easier fewer fingers · Harder eyes closed
Pinch a folded towel between thumb and index pad; hold without the thumb joint collapsing.
Easier gentler pinch · Harder 15-s holds
Each couplet: 60 s scored → the loading set → 10 s to move on. Done at 12:00.