Overview. The LifeSpan TR4000i is a very highly rated treadmill, receiving great reviews from experts and users alike. Some of the most notable features include the large running deck, EZ folding system, strong motor and workout tracking via the LifeSpan Bluetooth adapter, making this a very good choice, especially given the very affordable price tag. Shop treadmills from DICK'S Sporting Goods for the best equipment for your home gym. Browse top brands like SOLE and ProForm to find the best treadmill for your workout. If you find a lower price on a treadmill somewhere else, we'll match it with our Best Price Guarantee. Runner's World, the folding TR4000i is a solid, durable and stable treadmill that supports serious runners. The 20" by 60" running surface is supported by a 1" deck and eight compression shock absorbers to provide cushioning that is safe for your knees, back and joints. Rated the #1 treadmill by Health Magazine and featured in Runner's World, the LifeSpan TR4000i Folding Treadmill is a solid, durable and stable treadmill that supports serious runners. The 20"x60" running surface is supported by a 1" deck and 8 compression shock absorbers to provide cushioning that is safe for your knees, back and joints. Popular LifeSpan Fitness TR4000i Folding Treadmill questions, problems & fixes. Find expert solutions to common issues, DIY guides, repair tips & user manuals for all Exercise & Fitness. Find great deals on eBay for lifespan treadmill parts. Shop with confidence. Skip to main content. eBay Logo: LifeSpan TR4000i Treadmill. New (Other) 5.0 out of 5 stars. 2 product ratings - LifeSpan TR4000i Treadmill. $874.00. Free local pickup. or Best Offer. Watch our one-minute tutorial on the quickest and mess-free way to lubricate your treadmill belt. How to Lubricate Your Treadmill Belt: 1. Remove the motor hood (which can be done by loosening Fitness manuals and free pdf instructions. Find the personal fitness user manual you need at