Well putting a lot of strain on the shoulder would make it hurt. However, when i practice coindrops, it doesnt really hurt because i roll onto my upper arm and shoulder then upper back. I guess the rotation/spin of your upper body reduces the pain and discomfort.
Also, maybe ur having pain on ur shoulder because ur slamming it on the ground. Just rotate your upper body so that you can roll onto your shoulder and it shouldnt hurt =] *or atleast not that much

Neepsterz Crew
I finally decided to go w/ a bboy name that better suits me. Bboy Shadow Vigilante . I chose this because "vigilante", i have a vigilante attitude, and "shadow", i kinda like dark themes...but not too dark to be emo =]
If you have questions, you can aim me, its Dark Iljimae (Im sometimes on =])
Or if you're more formal, you can pm me here or email me at
Shadowvigilante@live.com ... sry if its a little long