If you are training for TT...
Hmmm, I am no expert, but I find the way I am improving is having some short spinning sessions (about 10-15km on the road) - I don't allow myself out of the small chain ring... it sacrifices speed, but trains my legs to spin...
Because TT is what I want to race, I do not spend alot of time doing long rides, but tend to focus on 20-30km rides which are the distance I will TT over...
I do do occasional longer rides (40-50km) but these are more about increasing endurance than anything else.
Intervals are def useful for with TTs or crits... I suggest you search on this site for other discussion.
Good luck



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