This is what training, year over year, increasing the load of riding is all about in cycling. It’s what new people, on new high performance bikes simply don’t want to hear. That the way to get fast can not be purchased. Fitness is one of the most level playing fields in the world. Genetics have a part to play - but before that comes into it hard work, combined with hard work, and then some hard work will harden you up on the bike.
The kick ass engine is the point everyone wants to avoid working on. Its the product of you that can’t be bought, only earned mile after mile - day after day after weeks of riding without missing a day.