Did you mean to include more info?
N/T
Thanks for these heath tips for this
keen GP newbie, but well aged, paddler :-). Other info great too. Rick
Most will have no issues going to GP…
… but they may not paddle very fast or far either 
Like anything new, a bit of moderation goes a long way. GP, being relatively low stress, can make it easy to over do and not realize it. At least not until it’s done some damage that can’t fully heal in between paddles, and becomes something more…
Right!
Plus in my case, I was paddling rather hard for almost 2 hours with small frequent breaks for switching b/w 3 paddles. Being excited about it and trying to test the “limits” of the three paddles so that I could make-up my mind about them. Nothing hurt after that though, but I can affirm that bad habits and overdoing it will pretty much inevitably built-up to injury in the long run.
A different test for me would be to take them to a multi-hour relaxed paddle (whole day), which I have yet to do. With the wing I did not have any issues for the first 4-5 hours the first time I did that, until the last hour after we clocked about 15 miles of paddling or so when I began to feel some shoulder pain in one of my shoulders due to the repetitive motion and a high-angle position somewhat increased the discomfort. I got a weak spot there and even though I was not really tired overall it hurt if I used certain trajectory with the paddle. I’ve never felt this in short 2-3 hour paddling sessions even if they were at a “race” pace with the same paddle. The pain went away quickly so there was no injury, plus I have improved my technique since then so I doubt I would get the same problem again.
Same thing with rolling - while learning it is easy to overextend and get a painful shoulder, especially if the instructor starts with a very energy-intensive C-to-C roll with a large paddle…