Sunny Health & Fitness
Active 400 Smart Auto Incline Wi-Fi Treadmill
$599.99
Manufacturer price
Quick verdict
Best for: Best for sessions matching a 50-by-16-inch belt, 62.6-by-28.1-by-52-inch assembled frame, 1–9 mph speed, 2.6–12.3 percent automatic incline, and 300-pound limit; current folded dimensions and product weight are not published. Measure room and accept the model-specific compromise first.
- Buy if you need a lighter folding incline treadmill for walking, jogging, and controlled running Verify model, URL, warranty, and delivery at checkout.
- Skip if you need a wide belt, more than 9 mph, or a long stride-friendly deck A simpler alternative may fit better.
Where to buy
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9.0 mph
Top speed
50 × 16 in
Belt
300 lb
Max user
Auto 2.6–12.3%
Incline
Editorial assessment
Who this product is for
Sunny Active400 SF-T724012: It is a connected incline treadmill in the legacy catalog; the current page omits folded geometry and product weight, while its 16-inch belt and 9 mph ceiling limit fast running Judge it by fit and room, not the category label.
By Codex (GPT-5.6 Luna; source review)
Main advantages
Published facts: a 50-by-16-inch belt, 62.6-by-28.1-by-52-inch assembled frame, 1–9 mph speed, 2.6–12.3 percent automatic incline, and 300-pound limit; current folded dimensions and product weight are not published. They screen stride, capacity, and motor versus user workload. Strongest case: the current assembled frame and automatic incline fit your planned use.
Main limitations
Tradeoff: It is a connected incline treadmill in the legacy catalog; the current page omits folded geometry and product weight, while its 16-inch belt and 9 mph ceiling limit fast running The compact belt would make your stride or shared-use requirements feel constrained Specs do not predict noise, feel, cushioning, reliability, or service.
Space, fit, and setup
Measure the footprint in a 50-by-16-inch belt, 62.6-by-28.1-by-52-inch assembled frame, 1–9 mph speed, 2.6–12.3 percent automatic incline, and 300-pound limit; current folded dimensions and product weight are not published plus operating clearances. Check doors, stairs, ceiling, outlet, and placement; folding changes geometry, not weight.
Fit, setup, and ownership cautions
$599.99 was listed on the exact Sunny product page. The exact manufacturer page supplied an approved direct offer; live checkout availability is not asserted. Verify configuration, delivery, warranty, returns, and maintenance; retain receipt and model identity.
Consider instead
Compare with Sunny Active300 SF-T724011 or Pace500 SF-T724081. Use belt, storage, speed, price, and service terms; never substitute another generation.
Research basis
Primary basis: Sunny's exact SF-T724012 page supplied the belt, assembled dimensions, speed, incline, and capacity; folded dimensions and product weight were not stated on the current page. Manufacturer-spec assessment only; hands-on feel, durability, and service remain unmeasured.
Compare before you decide
Performance
Dimensions & Weight
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