I'm sorry if this has been discussed before. I couldn't find anything via the search bar.

Anyways, i have started riding my hand cycle daily, which feels great i must say!! I'm wondering if there is more i can do for my shoulders to help strengthen them for the future to avoid any injuries. I don't want to over do it of course, but i feel like i can handle some more exercise routine.

My main question i guess is: What types of shoulder exercises should i be doing to strengthen the muscles that i don't normally use in my shoulders? I am looking for just free weight (dumbbell) options at this point.