Hi
@upser
Thanks for the update. There are a few members who've returned to running with the knowledge that it's high impact and most often not recommended, as it can speed up the wear of the prosthetic joint. I'm sure if you had to run away from danger, or do quick jog to catch up to someone / something, you could. I don't know that it's necessary to test yourself at this point.
Consider swimming as exercise in an effort to slowly build up your muscles while preventing an injury to your new hip. My guess is you're short of breath because you're overdoing it. Ease into your walks if you haven't been walking, slowly increasing your distance. It would be wise to ice and elevate also after walking to reduce the risk of inflammation.
Wishing you the best as your body continues healing. Stay in touch and let us know how you're doing.