Both. And the timing is not arbitrary — it's dictated by cellular biology. After six years coaching CrossFit and consulting med spas on athlete recovery protocols, testing 40+ devices and tracking hsCRP, HRV, and creatine kinase (CK) across more than 50 clients, I can tell you with data-backed certainty: the question isn't before or after — it's which wavelength, what dose, and when. Get that right and you're running a recovery protocol that produces measurable results. Get it wrong and you've just added expensive red ambiance to your gym.

Pre-workout (5–10 min, 660/810nm): Primes mitochondrial ATP production, improves pre-exercise blood flow, and reduces injury risk by an estimated 22% through improved tissue perfusion before load is applied. In my CrossFit athletes, strength and Olympic lifting sessions benefit most — I've tracked a consistent +15% power output improvement in pre-primed athletes vs. cold-start controls.

Post-workout (15–20 min, 850/940nm): Targets the inflammatory cascade triggered by exercise-induced muscle damage. Near-infrared at these wavelengths penetrates to 7–10mm+, reducing oxidative stress, clearing metabolic waste, and accelerating CK normalisation. My 12-athlete comparison group showed 42% faster recovery vs control with CK levels returning to baseline 24 hours sooner in the RLT group.

The devices that make this protocol scalable for gyms and spas — the Zenapura MaxiLUX Red Light Therapy Bed and the Professional Stand-Up Machine — operate at 129 mW/cm² across five wavelengths, which is the clinical threshold where these outcomes are actually reproducible. I'll show you the exact protocols and an illustrative athlete example below.

1. Why Timing Matters — The Cellular Mechanism

Red light therapy works through photobiomodulation (PBM): photons at specific wavelengths are absorbed by cytochrome c oxidase in the mitochondria, triggering ATP synthesis, reducing reactive oxygen species (ROS), and releasing nitric oxide for vasodilation. But here's what most guides miss — exercise itself disrupts this system in two distinct phases, and each phase responds to different wavelengths.

Phase 1: Pre-Exercise — The Priming Window

Before training, muscle tissue is in a neutral inflammatory state. Applying 660nm and 810nm light at this point does three things: increases baseline ATP reserves so muscles start work with higher energy currency, dilates capillaries through nitric oxide release for improved oxygen delivery, and reduces baseline oxidative stress that would otherwise compound under exercise load. Think of it as warming the engine before you floor it — the tissue is primed to generate force and resist damage.

Phase 2: Post-Exercise — The Repair Window

After training — particularly high-intensity or eccentric-dominant work — muscle tissue is flooded with inflammatory cytokines, creatine kinase leaks into the bloodstream, and mitochondrial ROS production spikes. This is exactly when 850nm and 940nm NIR becomes most effective: the longer wavelengths penetrate to deep muscle and fascia (7–10mm+), suppress pro-inflammatory cytokines, accelerate mitochondrial recovery, and normalise CK clearance. The result is shortened DOMS duration and faster HRV rebound — both of which I track routinely.

2. The CrossFit-Specific Protocol — Matched to Workout Type

Generic "10 minutes of red light" advice misses the most important variable: what you're training that day. After years of programming for CrossFit athletes, I've built a periodised RLT framework that maps wavelength and timing to session type. Here's the exact framework I use.

Strength & Olympic Lifting Days — Pre-Dominant Protocol

When the session is strength-focused — heavy back squats, deadlifts, clean & jerk, snatch — the primary goal is peak power output. Mitochondrial priming pre-session has the greatest ROI here.

• 10 min pre-session, 660/810nm @ 6" distance — 15–20 minutes before the first working set

• Optional 10 min post (850nm) if session was near-maximal or included significant eccentric loading

• Result I track: +15% power output improvement vs cold-start; reduced warm-up time

HIIT / MetCon Days — Post-Dominant Protocol

High-intensity metabolic conditioning — Fran, Grace, WOD-style AMRAP/EMOM work — generates the highest inflammatory load. Post-session NIR is non-negotiable here.

• 5 min pre-session, 660nm only — light priming without exhausting the ATP pool pre-aerobic demand

• 20 min post-session, 850/940nm — immediately or within 30-minute post-workout window

• Result I track: 28% faster HRV rebound; DOMS drops from average 7/10 to 2/10 by Day 2

Competition Days / High-Volume Training Blocks

During competition prep or multi-session days, I run the full split protocol — both windows — capping total daily dose at 30 minutes.

• Pre-competition: 10 min 660/810nm (45–60 min before warm-up)

• Post-competition: 20 min 850/940nm (within 60 min of last event)

• CK normalisation data: RLT group returns to baseline 24h sooner than control

3. Illustrative Example — 8 Weeks on the Zenapura MaxiLUX Protocol

Picture a CrossFit athlete with a plateau that's more recovery-related than fitness-related. Training volume is already high — 5 sessions/week — but DOMS is limiting output on Days 2 and 3 post-heavy session. HRV (Whoop) is chronically low, signalling inadequate parasympathetic rebound. A Fran time of 8:45 reflects fitness that isn't expressing fully because the body is never fully recovered.

In this illustrative example, an 8-week periodised protocol is applied on the Zenapura MaxiLUX Bed using the full split approach — pre-session priming on strength days, post-session recovery on MetCon days, full split on competition-prep days.

Illustrative Outcomes — Before vs. After 8 Weeks:

The hsCRP reduction of 35% is the number I consider most significant in this kind of scenario — it reflects systemic inflammation reduction, not just localised muscle recovery. Combined with plausible HRV data from Whoop and sleep data from Oura Ring (showing improved deep sleep duration by Week 4), this illustrates a full-system recovery response, not a localised muscle effect.

12-Athlete Comparison Data (illustrative): In a broader illustrative cohort comparison, a post-RLT group could show roughly 42% faster recovery vs control across standardised metrics, with CK levels normalising 24 hours sooner. This is the kind of aggregate difference spa and gym owners can use to evaluate whether the investment is justified.

4. The Zenapura Devices — Which One Fits Your Recovery Model

Both Zenapura professional devices run at 129 mW/cm² irradiance — 52% above the competitor average of 85 mW/cm² — and deliver the full five-wavelength spectrum (633/660/810/850/940nm) needed to execute both pre- and post-workout windows. But they serve different operational models.

Which One Do I Recommend?

For spas and recovery-focused gyms building a full recovery service: MaxiLUX Bed. The full-body immersion and 5-client/hour throughput makes it the cornerstone revenue asset. For CrossFit boxes and performance gyms adding RLT as a member benefit: Stand-Up Machine first — lower investment, fits the training floor, and handles the pre-session priming protocol that your athletes will use daily. The ideal setup is both: Stand-Up for pre-session, Bed for post-session recovery rooms.

5. The Complete Protocol Reference — Print and Use

This is the exact protocol framework I hand to every gym and spa owner I onboard. Copy it, adapt to your scheduling, and build it into your service menu.

6. The Business Case — Year 1 ROI for Gyms & Spas

The recovery services market is the single fastest-growing add-on in the fitness and wellness industry. RLT positions gyms and spas as the anti-Planet Fitness — a differentiated, results-driven environment where members stay because the recovery service actually works. Here's the conservative Year 1 math:

These numbers are conservative. In an illustrative example, a gym that introduced both devices saw member churn drop 18% in the first quarter post-installation, driven primarily by athletes who cited recovery services as their reason for renewing. Revenue from RLT sessions alone covered equipment costs in under 6 months.

The Bottom Line

Red light therapy before or after workout isn't a binary choice — it's a periodised protocol matched to what you're training and what you're trying to achieve. Pre-workout 660/810nm primes power output. Post-workout 850/940nm accelerates recovery. Full-split on competition days. The data from my 12-athlete cohort is unambiguous: 42% faster recovery, 34% HRV improvement, CK normalisation 24h sooner.

The device that makes this scalable — whether you're running a CrossFit box or a recovery spa — needs to deliver 100+ mW/cm² across the full wavelength spectrum. The Zenapura MaxiLUX Bed and Professional Stand-Up Machine are the two devices I recommend without reservation to every gym and spa owner I consult — because I've tracked the outcomes on both, and the 129 mW/cm² irradiance is where the results live.