How often should I do HYROX race simulations?

A sound approach: weekly in the final ~6 weeks, alternating a hard (race-effort, ~Z4) simulation with an easy (Z2) one. The easy weeks give specificity without the recovery cost of going hard every time. Rarely in the base phase — that's for building the aerobic engine.

Should my last simulation be right before the race?

No. Your last hard simulation should be ~10–14 days out, with race week kept light (a short opener), so you arrive fresh rather than fatigued.

HYROX race simulations: how to actually use them

The myth: to get race-ready, grind a full HYROX simulation every week. It feels logical — practice the exact thing. So athletes hammer full sims week after week and end up flat and slower.

Why blunt weekly sims backfire

Specificity is real: the SAID principle (Specific Adaptations to Imposed Demands) means simulations build what nothing else can — compromised running (running on station-trashed legs), pacing across 8 rounds, roxzone transitions, and economy under fatigue. But a hard sim is a near-race effort with a matching recovery cost; done all-out weekly it erodes your aerobic base — and concurrent-training meta-analysis (Schumann et al., 2021) shows that base comes from volume, not race rehearsals.

The fix: alternate hard and easy sims

For the final ~6 weeks, simulate weekly but alternate the intensity — polarized training applied to the sim itself:

Hard week (race effort, ~threshold/Z4): a full or two-thirds sim at the pace you'll actually race — your pacing and fatigue-resistance stimulus.
Easy week (Z2): the same movements and transitions at conversational effort — pure skill, economy, and aerobic volume at minimal recovery cost.

Alternating gives you race specificity every week while the easy sessions absorb the recovery, so you never dig a hole.

The one rule: taper the finish

Put your last hard sim ~10–14 days out; race week is light (a short opener, never a Z4 sim), so you arrive fresh. Keep light strength-endurance maintenance throughout so you don't detrain the sled and carries.

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