What is the difference between flexibility and mobility?

Flexibility is how far a joint can move passively, when something else does the work. Mobility is how far it can move while you actively produce force and stay in control. Training cares about mobility, because usable range under load is what shows up in your squat, your overhead position, and your lifts.

Why does my squat depth disappear when I add weight?

Because you have the passive range but not the strength to control it under load. Your nervous system protects positions it cannot stabilise. The fix is end-range strength work, like tempo squats and pause split squats, so your body trusts the depth enough to keep it when the bar is on your back.

Is the Jefferson curl safe?

It can be a useful loaded end-range hamstring tool, but it is easy to do badly and it is not a beginner movement. If your hinge is not solid or your back is irritable, skip it and use controlled options instead. If you do use it, start very light, move slowly, and ideally get coached on it first.

How is training mobility like strength different from stretching?

Stretching chases passive range. Training mobility like strength uses slow tempos, pauses, and holds at end range so you build the ability to produce force in those positions. That is what makes new range stick, because the body keeps range it can control.

Can beginners train end-range strength?

Yes. Scale the range before the load. Squat to a box, shorten the split squat pause, do shoulder lift-offs with a small range and no weight. Control is trainable from any starting point, and range grows out of strength rather than being forced.

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End-Range Strength: Why Flexibility Alone Doesn't Last

End-Range Strength: Why Flexibility Alone Doesn't Last from CrossFit BC. Stretching gives you range your body gives back. A CrossFit BC coach's guide to building end-range strength so your mobility actually sticks, with a…