It is amazing the progress you rugby guys manage to make – I take my hat off to you!
I do some speed work in NFL (american football) and they have a 17 week season plus finals (16 games to the finals) – leaves a lot of time for offseason gains!
Some of these guys are true sprinters – I had 3 preparing last year for the combine tests who were running close to 4.3 second 40 yards at bodyweights of around 110 kg.