Same for me. I am very thin, slim hands. My first smartphone nearly destryoed my hands. 1. Stopped using phone in subway. I used to look down - strain my neck.

Same for me. I am very thin, slim hands. My first smartphone nearly destryoed my hands. 1. Stopped using phone in subway. I used to look down - strain my neck. 2. 30 Pushups everyday 3. Once a week walk/run 5 km Fixed it.