The University of California (Berkeley), which has one of the best college rugby programs in North American has posted the strength training routine their playes use online. I've had some success with it after tweaking it to suit my own needs. Have a look at
(This Is What I Do) Monday: Chest and Back Tuesday:Legs and Abs Wednesday: Arms Only Biceps, Triceps Thursday: Shoulders And Abs Jog 3 times a week after workout's about 25 to 30 minutes whatever fits you the best. (EAT HEALTHY PLEASE!) Chicken, Fish, Turkey Bake only (NO FRIED FOOD) Eat Peanuts if you feel like snacking (Walnuts,Cashews, Almonds) (DRINK WATER ONLY) GOOD LUCK!