Hybrid racers need to be good at both running and lifting. Training both at once is called concurrent training. Done badly, each can hold back the other. Done well, you can improve at both.
The interference effect
Research has long suggested that heavy endurance training can blunt some strength and muscle gains, and that fatigue from one type of training can reduce the quality of the other. For most hybrid racers, the effect is modest — but fatigue management matters.
Practical rules
Separate hard sessions
Avoid a hard run and a hard lift on the same day if you can. If you must, separate them by several hours.
Put the priority first
If you do both in one session, do the most important one first. Close to a race, that is usually the running or race-specific work.
Easy runs pair well with strength
An easy run and a strength session on the same day works well. The easy run adds little fatigue.
Watch leg fatigue
Heavy squats and deadlifts can leave your legs tired for a day or two. Do not put them the day before a hard run.
A sample week
- Monday: Strength A + easy run.
- Tuesday: Threshold run.
- Wednesday: Easy run or rest.
- Thursday: Strength B.
- Friday: Rest.
- Saturday: Compromised running or race simulation.
- Sunday: Easy long run.
Adjust to your schedule. See structuring a training week.
Recovery
More training types mean more need for recovery: sleep, food and rest days. See sleep and recovery.