Wow. Sleep - it isn't as I try to get good sleep every day, but the moment I lie down my brain gets into overdrive.
Exercise - great. If I wasn't bored to death while doing exercise it might work.
Music - great. I get headphones and start vibing to the music, forgetting what I wanted to do in the first place, but I apply creativity and make AMAZAING playlists...
Really, who ever wrote all that down has no ideas what ADHD is. These are calming ideas for normies.
Watching funny movies - yep, I do that for four or six hours at a time, but it doesn't make me more productive.
Sun - hmm, all the vitamins I take haven't cured me, neither did crusing in my old convertible getting sunburn on my neck and arms
Pets - You really want a pet to stay at my place, where I have to regularly take care about them? Poor pet. I might forget feeding for a few days. O. t. o. h. I have a lot of plants, every single one quite drought resistant by natural selection.
Stay positive - yeah, as long as my impulsivivity isn't giving me intrusive ideas.
Ok, I have lived all my life with my own ADHD brain, and I really do have a number of strategies that help. But crap like this guide trivializes the struggle and it doesn't make me calm, it just makes me angry.