In-depth review
What it's like to own
The Active 400 is the lighter alternative to Sunny's assembled model: 108 lb, folds upright with a soft drop, and still has 15 levels of motorized incline to 12%. It connects over Wi-Fi to the free SunnyFit app and can cast workouts to a smart TV.
The 50 × 16 in belt is the narrowest of the full-size treadmills we cover. It's fine for walking and jogging; bigger runners may feel boxed in. The 2 HP motor and 9 mph top speed reinforce that this is a walk-and-jog machine first.
Amazon's reviews for this listing go back to 2016, so many of them describe earlier Sunny treadmills sold on the same page.
