Would skateboarding and running on the treadmill be good ways to exercise?

Treadmill is safer!: I'm delighted to hear that you are exercising, or at least thinking about your exercise options. Walking and/or running on a treadmill are adaptable exercises for most people. If you are skateboarding, remember to wear a helmet and wrist, elbow, and knee pads. Spinning (cycling to music in a supervised class) is one of my favorites: low joint impact and no risk of falling or being hit by a car!