Sport-Specific Training Is Called Practice

Somewhere along the way, sport-specific training came to mean doing your sport in the gym with weight attached. Weighted bats. Cable swings. Medicine ball throws that copy the throw.

Your sport already has a place where you get better at your sport. It is called practice, and you have it four days a week.

What each one is for

Practice is where the skill lives. Reps of the actual movement, at the actual speed, against the actual thing you play against. Nothing in a gym replaces that and nothing in a gym should try.

The gym is where the body that performs the skill gets built. Joints that hold. Muscles around those joints that share the work. Capacity that lasts into the fourth quarter. Correction of the shape your sport is quietly putting you into.

Those are two different jobs and they do not substitute for each other.

Why copying the sport backfires

Add load to a skill movement and you change the movement.

A pitcher throwing a weighted ball is not throwing. The timing is different, the sequence is different, and the arm is being asked to decelerate something it was not built to decelerate. He is now practising a slightly wrong version of the most repeated movement in his sport, and he is doing it under load, which is the fastest way to make a pattern permanent.

The same is true of a batter swinging heavy, or a lineman doing a loaded version of a get-off. You get a worse rep of the skill and a worse training effect than either would have been on its own.

What actually transfers

The same three things, for every sport.

Joint health. Shoulders, hips and knees able to do their full job under load.

Symmetry. Your sport is asymmetrical. All of them are. Training is where that gets answered, not reinforced.

The supporting cast. Stabilisers and fixators, trained on purpose, because the sport uses them constantly and never develops them.

A pitcher's gym work should build a shoulder complex that survives a season and undo what a hundred and fifty innings did to his hips. Almost none of it looks like throwing. All of it shows up in how he throws.