How to Build a Training Block That Won't Break You

Every ultrarunner knows someone who trained brilliantly for a big race, showed up fit and ready, and then spent the next six months rehabbing an injury. It's a familiar story, and it usually comes down to the same mistake: building fitness faster than the body can absorb. Training blocks that work are built on patience, consistency, and a clear-eyed understanding of what your body can handle.

Start with where you are, not where you want to be. If you're running thirty miles a week and you want to run a hundred, the gap between those numbers is where injuries live. The rule of thumb most coaches use is to increase weekly volume by no more than ten percent, and to hold steady every fourth week to let your body adapt. That sounds conservative, and it is. It's also how runners stay healthy long enough to actually get fit.

The Long Run and the Back-to-Back

The long run is the cornerstone of ultrarunning training, but it's not the only tool. Back-to-back long runs, where you run long on Saturday and again on Sunday, teach your body to run on tired legs in a way that single long runs can't. They're also more demanding, so introduce them gradually. Start with a moderate long run followed by a shorter one, and build from there.

What matters most on long runs isn't pace. It's time on feet, fueling practice, and gear testing. Use these runs to figure out what you can eat and drink without stomach issues, how your shoes hold up over hours, and how your body responds to different terrain. Race day is not the time to try new things.

Vertical gain deserves its own training block, especially if your goal race has serious climbing. The best way to get better at climbing is to climb, but you can supplement with hill repeats, stair workouts, and strength training. Don't neglect descending either. Downhill running beats up your quads in ways that flat running doesn't, and the runners who suffer most late in races are usually the ones who didn't train the descents.

Strength, Recovery, and the Long View

Strength training is the most underused tool in most ultrarunners' arsenals. You don't need to become a gym rat. Two sessions a week focused on single-leg strength, hip stability, and core work will pay off in injury resistance and late-race durability. Bodyweight exercises, resistance bands, and a few dumbbells are enough for most runners.

Recovery is where fitness actually gets built. Sleep, nutrition, and easy days are not optional extras. They're the foundation. If you're crushing workouts but sleeping five hours a night and eating poorly, you're borrowing against future performance. The runners who last in this sport are the ones who treat recovery as seriously as training.

Finally, think in seasons, not weeks. A training block is a means to an end, and the end is a long career of running trails you love. Take the off-season. Take rest days. Skip the race if you're not recovered. The trails will still be there, and so will you.