For me, it's biking.
I've been biking for a very long time but it was only this year that I started again, it all started with a pretty solid crash!
I have felt the difference in power and stamina between the rides. Running has helped me with my explosive starts and climbs. My last outing at Cathkin Braes was a success and I was able to even climb the track that lead to the fun bits!
Anyone in the Glasgow area should check it out. Awesome place for all level.
What is your other poison?