Sleep &
Magnesium.

Sleep is the cheapest performance lever you’ve got

Most Hyrox athletes spend significant time and money on the visible parts of recovery — the percussion massager, the supplement stack, the foam roller — and ignore the lever that moves the needle most: sleep duration and quality.

The Mah et al 2011 study at Stanford gave college basketball players an extra hour of sleep per night for 5-7 weeks. The result: measurable improvements in sprint performance, free-throw accuracy, and reaction time. None of those are sport-specific — they’re the same systems you rely on for sled-push pacing and wall-ball accuracy at rep 80.

The corollary: under-sleeping is the silent recovery debt. You can foam roll, take creatine, eat enough protein, and still wake up shot if last night was 6 hours. Hyrox prep blocks are 12-16 weeks of accumulated sleep load — under-sleeping for two of those weeks compounds.

Why magnesium glycinate matters specifically

Magnesium is involved in over 300 enzymatic processes, including muscle relaxation, energy metabolism, and nervous-system regulation. The Boyle et al 2017 review (PMID 27875740) summarises the case for athletes specifically — magnesium status correlates with grip strength, vertical jump, and anaerobic capacity, and athletes routinely sit at the lower end of the population intake distribution because of higher sweat losses.

The form matters. Magnesium oxide is cheap, poorly absorbed, and a common cause of GI upset. Magnesium citrate absorbs better but tends to cause looser stools at higher doses. Magnesium glycinate (or bisglycinate) is the form most consistently chosen in sleep and athlete-supplement protocols — well-tolerated, well-absorbed, and the glycine itself contributes mildly to relaxation.

For Hyrox athletes specifically, the dose-response curve flattens around 300-400 mg of elemental magnesium glycinate. Taking 600+ mg doesn’t add benefit and may push you toward the GI side effects.

Where ashwagandha fits

Ashwagandha is an adaptogen — a category of herbs that purportedly helps the body manage stress. The category gets oversold but the evidence for ashwagandha specifically is reasonable. The Salve et al 2019 RCT (PMID 31728244) showed measurable cortisol reductions in stressed adults given 600 mg of KSM-66 extract daily over 8 weeks.

Translation for Hyrox: ashwagandha earns its place in your stack during the heavy weeks of a build block, when your training stress is high enough to push evening cortisol up and your sleep starts slipping. It’s not a daily-driver supplement for general fitness — it’s a tool you reach for when stress load is climbing.

How to actually fix your Hyrox-prep sleep — five steps

Most “sleep optimisation” content is overcomplicated. Five things, in order of impact:

1. Fix the schedule before the supplements. Same bedtime, same wake time, even on weekends. Most athletes have their sleep wrecked by inconsistent timing more than by any single bad night.
2. Cool, dark, off screens. Bedroom around 18-20°C, blackout where possible, screens off 30-60 min before bed. The basics work.
3. Magnesium glycinate, 200-400 mg, 30-60 min before bed. Switch Sleep+ packages this with ashwagandha and zinc — single capsule, single moment, easy compliance.
4. Nasal strips on race-trip nights. Hotels are dry and unfamiliar. Mouth-breathing in dry air dehydrates you overnight, which compounds the next day’s race-week soreness.
5. Ashwagandha during peak weeks. Add only when training stress justifies it — typically the four hardest weeks of a 12-week block.

Don’t add sleep tracking devices to this list. They’re useful for awareness, not for changing behaviour. The above five do most of the work.

The category lineup

Three products cover the Hyrox-relevant sleep and magnesium spectrum without overlap:

• Switch Sleep+ Capsules ($69.95, 25% commission) — magnesium glycinate + KSM-66 ashwagandha + zinc. The full daily-driver stack in one capsule.
• SuperFeast Ashwagandha ($57, 30% commission) — standalone KSM-66 root extract for athletes who already have a magnesium source and want to add ashwagandha during peak weeks.
• Switch Sleep+ Nasal Strips ($29.95, 25% commission) — single-use airway-opening strips for race-week travel.