Reebok Nano X3 Review: Best CrossFit Shoe for Lifting and Running

Anyone who’s done a heavy squat followed immediately by a 400-meter run in a CrossFit workout already knows the challenge: you either sink into a soft heel or clomp along like a brick. The Reebok Nano X3 attempts to solve that friction with a mechanical trick under the foot — a rigid plate that firms up under load and softens when you need to move — and at $150 and 10.5 ounces, it’s the 13th version of a shoe that has dominated CrossFit gyms for nearly a decade, and this time the engineering changes how you think about a do-it-all trainer.

Weight: 10.5 oz (men’s size 9) ·
Heel-to-toe drop: 7 mm ·
Cushioning: Floatride Energy Foam ·
Best for: CrossFit, HIIT, weightlifting with moderate running ·
Price range: $130 – $150 ·
Release year: 2023

What is the Reebok Nano X3 for?

The Nano X3 is designed as a cross-training shoe for CrossFit, HIIT, weightlifting, and short-distance running. Its core innovation is the Lift and Run (L.A.R.) Chassis System, which employs a dome-shaped TPU piece in the heel that hardens under heavy loads and Floatride Energy Foam for responsiveness, addressing the longstanding trade-off between stability and cushioning in CrossFit footwear, according to Garage Gym Reviews (equipment testers).

Purpose for CrossFit and HIIT

• The sculpted heel and Lift & Chassis system provide stability during Olympic lifts, box jumps, and rope climbs.
• Full rubber outsole ensures grip on various gym surfaces (That Fit Friend (gear reviewer)).
• Floatride Energy foam delivers responsive cushioning for plyometric movements.

The pattern: Reebok engineered the X3 to handle the sport’s widest range of demands — from deadlifts to double-unders — without forcing athletes to switch shoes mid-workout.

Purpose for weightlifting

• The L.A.R. chassis provides a rigid heel platform for squatting and deadlifting.
• Moderate 7mm heel drop supports proper form during Olympic lifts (Coach Magazine (fitness publication)).
• Lab measurements by RunRepeat (independent lab tester) confirm a stack height of 27mm heel and 19.4mm forefoot, creating a stable, low-to-ground feel.

The implication: For most CrossFit athletes lifting up to around 500 lbs, the X3 provides sufficient stability without the elevated heel of a dedicated lifting shoe like the Romaleos, which offer more heel elevation for maximal lifts.

Purpose for running and cardio

• The Floatride Energy foam absorbs impact, providing a smoother heel-to-toe transition than earlier Nano models (TechRadar (tech and fitness editorial site)).
• Weighs approximately 10.5 oz (men’s size 9) — lighter than many trainers but heavier than pure running shoes.
• Multiple sources agree: it’s suitable for 1-2 mile runs, but not recommended for distances over 5 km (That Fit Friend (gear reviewer)).

The catch: The X3 is the most runnable Nano yet, but it’s still a training shoe trying to be a running shoe — and the compromise shows at mile three.

Are Reebok Nano X3 good for walking?

The Nano X3 offers moderate cushioning suitable for short walks — think walking to the gym or a quick errand — but the firm heel and stable base designed for lifting make it less comfortable for all-day walking, according to That Fit Friend (gear reviewer).

Cushioning and comfort for walking

• The Floatride Energy foam is responsive but not plush; it prioritizes energy return over softness.
• Weight of 352g (men’s US 9) per RunRepeat (independent lab tester) is heavier than the average training shoe (312g), adding fatigue during extended walking.
• Removable insole allows users to insert custom orthotics for improved comfort (That Fit Friend (gear reviewer)).

Arch support and flexibility

• The Nano X3 offers good arch support and a roomy toe box, beneficial for many foot types, according to podiatrist discussions on stability training shoes.
• Some podiatrists recommend Reebok training shoes for their stability and shock absorption (Suffern Podiatry (foot health blog)).
• Individual recommendations vary; foot type and existing conditions determine suitability.

Comparison with dedicated walking shoes

• Dedicated walking shoes (e.g., Hoka Clifton, New Balance 990) offer softer midsoles and lower weight for sustained comfort.
• The X3’s rigid heel chassis works against the natural flex of walking gait over long distances.
• Podiatrists generally recommend the Nano X3 for training, not primary walking.

What this means: If your day involves walking to and from the gym, the X3 will serve you fine. If you’re planning a weekend city walk, buy a dedicated walking shoe.

Are Nano X3s good for weightlifting?

Yes — the Nano X3 is one of the most stable training shoes for weightlifting, thanks to its Lift & Chassis system providing a rigid heel platform that aids moderate to heavy lifts (Garage Gym Reviews (equipment testers)).

Stability for squats and deadlifts

• The flat, wide heel with the TPU dome creates a solid base comparable to dedicated lifting shoes for loads up to ~500 lbs (That Fit Friend (gear reviewer)).
• Stack height of 27mm heel (thicker than average 24.7mm) per RunRepeat (independent lab tester) keeps the foot close to the ground.
• The 7mm drop helps maintain upright torso position during squats.

Heel rigidity and flatness

• The L.A.R. chassis includes a dome TPU piece that hardens under heavy loads, preventing heel compression (Garage Gym Reviews (equipment testers)).
• Heel is flat and non-elevated, unlike the raised heel of dedicated lifting shoes.

Comparison with dedicated lifting shoes

• Dedicated shoes (e.g., Nike Romaleos, Adipower) offer 15-20mm heel elevation, which improves squat depth for some lifters.
• The X3’s 7mm drop is lower, making it better for deadlifts and Olympic lifts where a flatter stance is preferred.
• For maximal lifts above 500 lbs, a dedicated lifting shoe may provide additional stability.

The pattern: The Nano X3 bridges the gap between a flat shoe and a lifted heel — it’s optimized for the variety of movements in CrossFit, where you might squat one minute and run the next.

What is the difference between Nano X3 and X4?

The Nano X4 features a redesigned knit upper that is lighter and more breathable, while the X3 uses a layered mesh with overlays for durability, according to comparisons by Coach Magazine (fitness publication). Here’s how they compare across key dimensions:

Six differences, one pattern: each model optimizes for a different primary demand — the X3 for durability and stability, the X4 for weight and breathability.

The trade-off: Buyers choosing between X3 and X4 are deciding whether they value stability and durability (X3) or lighter weight and breathability (X4). The $20–$30 price gap favors the X3 for budget-conscious lifters.

Are Reeboks recommended by podiatrists?

Some podiatrists recommend Reebok training shoes for their stability and shock absorption, which can benefit athletes with certain foot conditions. The Nano X3 offers good arch support and a roomy toe box, making it suitable for many foot types, according to Suffern Podiatry (foot health blog).

General podiatrist stance on Reebok shoes

• Podiatrists often recommend Reebok training shoes for their stability and shock absorption (Suffern Podiatry (foot health blog)).
• The brand’s cross-training shoes are sometimes cited as good options for athletes with flat feet or overpronation due to their firm midsoles.
• Individual recommendations vary; consulting a podiatrist for specific foot conditions is advised.

Specific considerations for the Nano X3

• The removable insole allows users to insert custom orthotics for tailored arch support (That Fit Friend (gear reviewer)).
• Stable heel and flat platform reduce ankle strain during lifts.
• However, the shoe is not designed for long-distance walking, and prolonged wear may cause discomfort for some users.

Foot type and arch support recommendations

• The roomy toe box accommodates wider feet, reducing pressure on bunions.
• The firm midsole provides stability for flat feet but may feel too rigid for high arches.
• Podiatrists typically recommend trying the shoe with workout socks and consulting a specialist for pre-existing conditions.

The implication: While the Nano X3 receives general approval from some podiatrists for training use, it is not a universal recommendation — foot type, arch height, and specific conditions determine suitability.

“Awesome fit, extremely comfortable upper, cloud-like cushioning.”

— RunRepeat reviewer (RunRepeat (independent lab tester))

“I prefer the Nano X3s for running over my old Nano 8s. They have a little higher heel drop and cushion.”

— Reddit user, r/crossfit

“Reebok shoes are often recommended for their stability and shock absorption.”

— Suffern Podiatry (foot health blog)

Nano X3 vs Nano X2 comparison

The major upgrade from the Nano X2 is the addition of the Lift and Run chassis, which transforms the shoe’s stability for lifting while maintaining running capability, according to Coach Magazine (fitness publication). The X3 retains the 7mm drop of previous models, helpful for squatting.

Four upgrades, one pattern: the X3 adds mechanical stability hardware that the X2 lacked, making it the better choice for heavy lifting without sacrificing runnability.

The pattern: The X3 is an evolution, not a revolution — but the chassis upgrade is significant enough that heavy lifters should skip the X2 and go straight to the X3.

Key specifications

Eight specs, one pattern: the Nano X3 positions itself as a heavier, more stable training shoe that prioritizes durability and lift support over weight savings.

Pros and cons

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