Lifespan treadmill 'turbo pro' belt is not turning, looks to engage

Matt requested 3 quotes from Appliance Repairmen in Macmasters Beach

all controls light up, motor sounds like it wants to engage but stops and the belt does not turn at all.

Treadmill dismantled to get in door then put together again
Treadmill is in garage needs dismantling to get inside then once inside put...

Repair treadmill
Treadmill,life fitness.every thing lights up as normal when you turn it...

Treadmill - needing a new running belt for
Treadmill - needing a new running belt for machine

My Proform 520 treadmill is jerking making it dangerous.
The treadmill is ok when i am just walking but as soon as i start to pump up...