Like running on the treadmil or what?

Yes, if you prefer.: Less stress on feet and legs than running on hard surfaces. Many runners prefer outdoor running. Either way, proper fitting, supportive running shoes are essential.

Personal preference: Everyone is different as far as running on treadmill or outside. I prefer running outside, even in the cold of winter. Others want to avoid the temperature changes and different terrain. Just train wisely and consider cross training.

Yes: treadmill running is just fine. Just make sure that your stride and foot strike remain similar to when running outside.