Intensity is like caffeine.
If you drink three coffees a day and I pour you a fourth, you don't get much of a boost.
Too much intensity, too often, works the same way.
Stack too many hard sessions together, and you stop adapting to the training. You just get tired. The session that was supposed to make you faster is now just breaking you down.
Get the dose wrong often enough, and you get sick or hurt. You peak too soon. You plateau. You underperform on race day.
The athletes who respond best to intensity are the ones who've earned it. They've built a strong aerobic base and get real recovery. Then they drop some hard sessions in at the right time, and they do the job.
Most training should feel easy to moderate. Conversational. Like you could go longer if you had to. That's not being soft. That's the foundation the hard work sits on.
A coffee a day gives you a nice morning boost.
Accelerations. Hill sprints. Short, sharp efforts you can use regularly without burning out. That's your morning coffee.
Save the hard, race-specific stuff for when the foundation is solid and the race is in sight.
The right amount of intensity is individual and depends on your race distance. Some athletes can handle more. Some need less. This changes with experience and years of training.
Caffeine is most effective when you haven't had too much of it. Intensity works exactly the same way.
