Your body does not know paces - it only knows intensities. This means the actual speed of movement in training is irrelevant. What matters is which energy systems are working and which part of your physiology is being targeted. If speed alone made you faster, running downhill would be the best training method.
Why Carbon Shoes in Training Offer No Physiological Benefit
Carbon plated shoes make you faster at the same effort. That sounds great until you realise what it means for training. You are increasing your speed while maintaining the same intensity - which yields zero additional training stimulus.
The adaptation comes from the effort, not the pace. Running at threshold in carbon shoes and running at threshold in regular trainers produce the same physiological response. Your training should be guided by intensity, not pace. The only difference is that carbon shoes cost significantly more and wear out faster.
The Injury Risk Nobody Talks About
All of the small muscles, tendons, and ligaments in your lower legs and feet that develop strength through regular training shoes are effectively bypassed in carbon shoes. The plate does the work that those structures would normally handle.
Train in carbon shoes consistently and those structures never develop the resilience they need. Then, when fatigue strips away your form late in a race, those undertrained structures are suddenly exposed to forces they cannot handle. That is an injury waiting to happen.
The Psychological Advantage of Saving Them
Because carbon shoes are rarely worn in training, putting them on for race day creates a genuine mental shift. It feels like cheating - in the best possible way. At race pace, with fresh legs and shoes that feel like they are doing half the work, the confidence boost is significant.
Athletes who train in carbon shoes every day lose this advantage entirely. The shoes become normal rather than a race-day weapon.
The One Exception: Race Pace Simulation
There are two types of race simulation sessions: race intensity and race pace. Understanding this distinction is critical when approaching your taper. Race intensity sessions mimic the effort of the event - carbon shoes are not needed because the pace does not matter. Race pace sessions mimic the exact demands of the event, including speed over ground.
During race pace sessions, wear the shoes you plan to race in. This is the only time carbon shoes belong in training. And it should only happen once or twice before a race, at most.
Your body adapts to effort, not speed. Save the speed for race day and build real strength in training.