Just be careful - an activity centre near me had a bit of an incident recently. One of their students on a have-a-go didn't pay attention and instead of drawing back only until the arrow was about an inch ahead of the bow, drew back another couple of inches. This meant the tip was resting against the fleshy bit between thumb and fingers. Then they loosed the bow. I suppose it's one way to get a cheap piercing. Even a 20 pounder isn't going to have trouble driving an arrow through a little flesh like that and out the other side.