Very interesting. When I was 17 I started going to the gym and put on 2 stones in a period of a year or so. Me, my team mates and coaches have definitely noticed that I got a lot slower in my bowling. I used to be a opening bowler at U17. Now usually just a part timer, so I am concentrating on my batting now. Well I guess you win some and you lose some. So my advice is if you are thinking of gyming it out. You possibly will sacrifice looks for speed. I might be wrong, maybe more specific training would increase your bowling speed, with a professional cricket specific workout. If anyone has any Cricket specific workouts, please do share.