Training Load & Recovery

Arrange the week

Most runners do best with no more than two structured hard sessions a week plus a long run, and everything else easy. A long run that carries pace work counts as a hard session. Leave at least 48 hours between hard efforts, and 72 if you recover slowly. Take at least one full rest day a week. The guides on periodization and rest days cover both.

How fast to build

Start from the running you do now, not the running you want to do, and add in small steps. Think in a base that trends upward over blocks of three or four weeks and not in a fixed weekly percentage, because no percentage is a tested safe limit. The one randomized trial of a program built on the 10% rule, published in 2008, found no fewer injuries than a standard program, 20.8% against 20.3%¹.

What the best recent data does support is sizing each new long run to your recent running. In 5,205 runners followed for 18 months, a session more than 10% longer than the longest run of the previous 30 days went with more injuries, about 1.6 times as often for a jump of 10% to 30% and 2.3 times for more than double, while the week-to-week change in total distance showed no relationship to injury². A ramp that is gentle on total miles can still hide one session that is too big.

Load ratios, which compare this week with the average of earlier weeks, are context and not a trigger. In 461 recreational runners the link between the ratio and injury disappeared once runners already injured at the start were excluded³, and in the 5,205-runner cohort a higher ratio went with fewer injuries, not more². No ratio band is a validated line for runners to stay inside.

Lighter weeks

The usual rhythm is two or three weeks of building and then a lighter week, with volume cut by 20 to 30 percent. It is a habit and not a law. A newer runner on a gentle linear build can skip it, and anyone who feels flat early can take it early. How you are recovering decides whether a day is hard, easy or off.

Sleep and food

Protect sleep in the hard weeks. In a 2025 meta-analysis of 45 studies, sleep deprivation lowered aerobic endurance in athletes and made the same effort feel harder⁴. The guide on sleep for runners covers how much.

Food is the other half. A 2017 position stand says energy and macronutrients taken after high-volume or intense exercise may enhance recovery and tissue repair⁵, so eat carbohydrate and protein after your longest and hardest sessions. The guide on daily nutrition covers the rest.

Reading your body

One bad day is normal. A pattern across several days is the signal: workouts that feel harder at the paces you usually hold, legs that stay heavy, poor sleep, a flat mood, a higher resting heart rate than your own baseline. When the pattern shows, take an easier day or two before it becomes an easier month, and when in doubt err on the side of less. The guide on overtraining covers what to do and when to see a clinician.

Age is one input and not a rule. Recovery varies between people at every age, so judge it by how you respond. The guide on masters running covers older runners.

Time off

Stopping costs fitness, and a partial reduction costs less. In a 2023 systematic review of endurance athletes, complete cessation of training lowered maximal oxygen uptake through falls in blood and plasma volume, and a partial reduction in training may help limit the losses⁶. So between seasons turn training down and not off: keep some running, some strength, and cut total load by roughly a quarter. After an injury or illness, the guide on return to running covers the restart.