Robbie Morris won a couple of England caps and was a junior discus international.
Moving back a row or two, Victor Costello gained nearly 40 caps for Ireland and represented them in the 92 Olympics at the shot. I think Olivier Merle (now there's the template of a proper French 2nd row) was a good shot putter as well.
Scrummaging's not all about size and nor is throwing. If you want to see athleticism and technique in action check out the world junior record in the javelin at the weekend by Neeraj Chopra of India - 86m by a 19 year old! Or the ultimate, WR holder Jan Zelezny.