Immunity
2 articles
RecoveryAugust 13, 2026 · 8 MIN
Should You Train While Sick? The Neck Check Rule and Return-to-Training Protocol
Running through a common cold is usually fine. Training with a fever, chest infection, or body aches is dangerous. The neck check rule separates safe from risky — here is how to apply it, plus a 5-day return protocol.
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RecoveryJuly 7, 2026 · 8 MIN
Vitamin D for Endurance Athletes: Deficiency, Dosing, and Performance Impact
Over 60% of endurance athletes are vitamin D deficient — a silent performance killer affecting muscle function, immunity, and bone strength. Here's what the research says about testing, supplementing, and optimising your levels.
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