You should wear lighter shoes when running on a treadmill.
If you have lighter shoes, yes. Your joints and limbs require less cushioning as a treadmill absorbs shock far better than the road. Some shoe companies offer models specifically designed for ‘mill use, with less internal cushioning (especially at the forefoot and toes) and more external ventilation (to counter the heat-producing friction of TM belts). Or just switch out your heavyweight kicks for lightweight trainers or minimalist shoes. I run with my old shoes when I run on the treadmill cause I need less support and keep my newer shoes for when I run on the road 😉
1. Do you run in minimalist shoes?
2. What is your favorite shoe to run in?