My current training schedule for next 3D season includes:

-practicing indoors almost every day a week
-physical preperation including, power sit ups and running up and down stairs for cartiovascular indurance
-A good nutrition base including fruits, pasta, meat, and vegetables
(excluding all junk food ie.chips,chocolate,candy,fatty foods,and no soft drinks or alchohol).
-proper hydration is key as well, I tend to drink aproxematly
4 liters or one gallon per day.
-I also try to work on mental preperation during my practice.
-it is good to practice your yardage every once and a while during the winter so that your yardage skills stay sharp, then practice yardage almost every day when the snow leaves.