North Star Theory

NST topic path

Mobility

Learn how movement, flexibility, stability, and range of motion interact.

Step 1 · Understand

Mobility research

Is a foam roller worth it?

Last verified 12 Sept 2026

Yes, as a cheap warm up aid, less so for recovery. A pooled analysis found rolling gives a small short term boost to flexibility and sprint readiness before training, and a small drop in muscle pain after, so real but minor effects. It is cheap and lasts, so the bar to justify one is low.

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Do you need to warm up before lifting (or exercising)?

Last verified 12 Sept 2026

A short warm up is worth it: it reliably improves performance, and the evidence, though not conclusive, favours a lower injury risk. Raise your temperature with easy movement, then prepare properly, warm up sets for lifting, dynamic movement for running. About 5 to 15 minutes.

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Does strength training make you less flexible?

Last verified 12 Sept 2026

No, the 'muscle bound' idea is a myth. Full range strength training with real load improves flexibility about as much as stretching does; a 55 study review found no difference. Two conditions attach: train through a full range, and use external load, not just bodyweight.

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Does stretching help sore muscles?

Last verified 12 Sept 2026

No. A Cochrane review found stretching before, after, or both changes muscle soreness by about half a point on a 100 point scale, too small to feel, and a separate pooled analysis found a cool down stretch did not speed recovery. Gentle movement, massage or cold water help a little more.

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Does training through a full range of motion matter?

Last verified 12 Sept 2026

Across the trials, a full range of motion tends to build more lower body muscle and strength than partial reps, and the stretched part of the movement seems to be what matters. 'Lengthened partials' are promising but oversold. A shorter range is a tool for specific cases, not a default.

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Step 2 · Apply

Mobility guides

No reviewed mobility guides are published yet. Research remains the starting point.

Step 3 · Compare

Mobility comparisons

No reviewed mobility comparisons are published yet. NST only compares options when evidence and context are ready.

Start with the evidence, use a guide when you need a practical next step, and compare products only when the decision requires it.

How evidence is assessed