The treadmill has arrived and is assembled

The treadmill finally came on friday and I got it put together and tried it out. It's pretty cool! My legs felt like jelly after I got off. lol I used it again this afternoon for about 30 mins after my strength training. When I was done I had the sensation of falling backwards. I think I was maybe pushing a bit too hard or maybe it'll just take a while to get used to the motion of the treadmill.
My goal is to use it to be able to run a mile in 8 mins. Not exactly record breaking time but it would be a personal best for me ever. I did a mile last night in 17 mins, half walking, half running. I'm pretty sure if I tried I could do it in 15 mins tomorrow. We'll see!