I tried a rower for the first time a couple days ago, and found immediate relief from ADHD-like symptoms that lasts a few hours.

I'm not diagnosed, but have pretty severe trouble getting into a task-oriented mode, so much that dishes go unwashed, and my home is a mess. I feel the mess wearing away at me, but just can't deal with it. I'm not overly busy or tired, just procrastinating.

After 5 minutes on the rower my mood drastically improved and I was much more productive than usual, and the effect lasted about 3 hours. I've had a few more sessions since then with similar effects.

Also, it's a little spooky how often a subject comes on my radar, and then a few days later the subject surfaces on HN. Feels too frequent for it to be a coincidence.