On a treadmill, I'm running at 4.0. Treadmills are excellent pieces of fitness equipment for beginning runner training. A 4.0 jogger on a treadmill would take 15 minutes to complete one mile. Depending on stride length and leg turnover, this is a brisk walk for some and a sluggish jog for others. Treadmills were originally used as a way to exercise outdoors while indoors. This is useful when trying to keep fit during bad weather or when there's no space outside. Now they're widely used by people who want to get in shape - especially runners who like to work out on a fixed route. Treadmills are easy to use and can be set at different speeds. They allow you to increase resistance by using handrails or not, which makes them more challenging than free walking. You can jog on a treadmill at a speed equal to what your legs are capable of doing when running with the ground under your feet. So if you can run faster than that, then sure, go for it! However, it's not recommended because you risk injuryting yourself by running too fast on a device without any contact with the ground. The most common question about jogging on a treadmill is whether you can run while it's moving. The short answer is yes, you can run on a treadmill. But like anything else, you need to use good judgment and know what speeds you should be going at so as not to hurt yourself.