I use them for walking/jogging and have had no problem keeping them in my ears. I cannot wear the apple earbuds because they always fall out of my ears, even when just sitting at my desk. I have not used them during circuit training classes because I listen to the gyms music so cannot speak specifically to that. The sound quality is good enough that I can hear my music, podcasts, audiobook, etc. clearly. I have also used them to answer a call and had no problems with the sound. I would not say they are great for noise cancelling but I did not buy them for that purpose. I have had them since Christmas 2017 with no problems.
