Hyperactivity/restlessness. Over the summer, I would work 13 hour days on my feet. Even though my coworkers were tired and would be like "Oh, I can't wait to go home and get some sleep", I was never worn out by the job. I would come home and walk around the house (it was nighttime) and still be all peppy and awake.
I've noticed I have excellent time management skills and a somewhat decent focus (relative to others with ADHD) for the short periods I'm able to stay in one spot, but my restlessness and hyperactivity results in a lot of wasted time from getting up a bajillion times while I need to stay seated.

My hyperactivity also makes it difficult for me to maintain a healthy weight; I'm currently 10 pounds underweight.