Last year I did SSB, Short Power Build and the Gravity Plan (mostly low volume except for first session of SSB did mid-volume). I finished Gravity right around my first big race of the year and came out of the gates strong, fitness was at an all time high and it paid off for enduro. It was a race with roughly 4,500’ of climbing and I felt strong on transitions and was able to go full gas all day (roughly 25 minutes of racing) to win my class. No doubt that this formula will have you ready to go for the first / A race of your season.
Where things get more complicated is maintaining that level of fitness. The tough part with enduro is maintaining a balance between fitness and skills / outdoor rides. After my first race, I did a few gravity workouts per week and fitness felt on par for the next race in mid-June. Following this race, things declined. The series transitioned more towards bike park racing / lift-assisted stages and so did my riding. I did a TR ride per week focusing on peak power and didn’t focus enough on my aerobic base. I felt it big time on stages and ran out of gas. My ability to push hard through stages felt non-existent.
Currently working on a plan for next year. I think I’ll go through the same off-season training, likely low volume again, to allow time for skiing and outdoor rides. First race again next year is Memorial Day then from that point, I think I may focus more on just riding. The race season has something usually every week or two and I have no problem pushing pretty hard outdoors. Maybe throw in some road riding / xc racing, big days on the bike and try to keep a good base level of ~10 hours / week of riding which usually does the trick for me.
Don’t forget in the winter to supplement indoor riding with strength training. While the fitness aspect from TR is great, you’ll need more than strong legs and lungs.