I use the quadlock bracelet since now several months to go jogging but also sometimes in the gym during spinning or similar I am really delighted with the attachment. You slip even after long periods out of arm and the mobile phone is fixed always safe. The attachment and detachment of the mobile phone is also absolutely no problem. After I had a long time a cheaper mobile mounting for the arm, which has slipped permanently, etc., I'm really glad to have now discovered the quadlock bracelet for me. The slightly higher price should not put you off. It is worth it.