Earhoox. https://earhoox.com/
For whatever reason, all earphones fall out of my ears. Exercise, walking around the house, whatever - they just don't work for me. The Earhoox sort that 100%.
Only issues: I had to use a nail-clipper to cut the rough mold edges. They do fall off the earbuds quite easily when e.g. in pockets. But if I lost them, I'd order another pair that day.