Keep the components and the whole in view
Most progress comes from developing components well:
- easy aerobic work that creates room for more useful training;
- threshold or interval running with a specific purpose;
- strength work that makes event loads less costly;
- movement practice that meets the event standard efficiently;
- conditioning that makes useful output repeatable;
- occasional transitions or simulations that test how the pieces behave together.
Full simulations can be valuable, but they are expensive. They create fatigue, invite poor movement and give a noisy answer when several qualities fail at once. Use them as checkpoints, not as the default training method.