Cheers see how he goes this season injury laid him off from Xmas last year and theres as much collie as bull in him but I know what you mean he only gets what my collie whip grey gets and he defo shapes up better than her
I do about four miles on the road buts it broken up where I can let them off the lead abit I do that most nights but to get them drop abit of weight I trot them along the canal on my bike I take them about 5 mile each way
Don't think there's any short cuts to it I think a good 6 weeks getting them right with road work and trotting them on a push bike sets em up for a start and then a work them and there fitness will peak
Read skycats post at the top of page fitness and conditioning won't go far off getting a dog fit then just adjust it when you get to know your dog and depending on how much work it gets through the season