Will cycling make you a better trail runner? How to use the bike in your training

Yes, cycling can be a useful addition to your trail training. You work on your fitness without landing on the ground with every step. Especially if you want to move more often but don't want to run every session, the bike offers another way to build endurance. ^[1]

Cross-training means doing another sport alongside your main one. For a trail runner it can be very simple: an easy bike ride between two running days. You don't have to become a cyclist to enjoy it. A bike that works well, a familiar route and a clear aim for the ride are a fine place to start.

What do you train on the bike?

Cycling is endurance training: your heart and breathing work to supply your moving muscles with oxygen. This is called aerobic effort. Your feet stay on the pedals, so the repeated jolts of running landings disappear. So you train your fitness with a different load on your legs. ^[1]

A bike ride does count as training. A steep climb or a long ride into the wind can take a lot of effort, even though you never land on your feet. So decide beforehand what the ride is for: moving gently or training hard. If you want to spare your legs for a trail the next day, save the fast group ride and the chase for a high average speed for another time. ^[4]

Does cycling make you faster on the trails too?

Your fitness is useful in both sports, but a better trail time doesn't follow automatically from more kilometres on the bike. On the trails, how you handle the load of climbing and descending counts too. So give cycling its own job in your preparation: endurance with a different load. Save your running sessions for the parts where you want to grow as a trail runner. ^{[2] [3]}

What do you keep practising on the trails?

Descending calls for a different muscle action than simply pedalling. Going downhill, your leg muscles brake your body while lengthening under tension. This is called eccentric work, like slowly lowering a heavy bag. If you're not used to descents, you can end up with very stiff legs. Gradual exposure to downhill running helps you tolerate that specific load better. ^{[3] [6]}

So save running sessions for the terrain of your goal. Think of placing your feet between Ardennes roots, walking up a steep climb and descending in control on a clear path. Plan this kind of practice for when you have the attention and energy for it. A long bike ride beforehand isn't very helpful if you then want to focus carefully on where you put your feet.

Where does cycling fit in your running week?

Start with one deliberate swap in your existing week. Say you run regularly and you're thinking of adding one more easy loop. At that point, try a relaxed bike ride instead. Keep your other sessions the same for now, so you can see what that swap does for you. At your next run, notice how fresh you feel at the start and whether the combination stays doable.

Make the choice from your goal. If you mainly want to move regularly, cycling to work can find a practical place in your week. If you're preparing for a trail race, make room for the running sessions where you get to know the race terrain. If you enjoy both sports, feel free to plan a longer bike ride, but allow for it in the rest of your week. Even a fun session takes time and energy.

How easy is an easy bike ride?

Use your breathing as the first check. At moderate effort you can still talk, but singing gets hard; at hard effort you can only get out a few words before you need to breathe again. If you want relaxed endurance work, pick a pace where conversation stays easy. If you start gasping on a slope, shift to an easier gear and slow down. ^[4]

Forget the average on your bike computer for now. On a flat towpath an easy ride can turn out very differently from one on rolling roads with a headwind. For your first trial, pick a route where you can easily turn back. That way you can adjust the effort without a tough climb still waiting to get you home.

Which bike and route do you pick?

Start with the bike you have and sit comfortably on. For an easy trial ride you don't need to buy a new sports bike or measuring gear. Have a bike that hasn't been used for a long time checked first, and try the brakes and gears close to home. Pick a route you can handle easily on that bike; check beforehand that you're allowed to cycle there.

How do you start if you have little cycling experience?

Let your cycling experience decide how you start, even if you already run well. Begin with a short, simple ride and build up gradually. Pay attention to your riding position too: you need to be able to move comfortably and reach your brakes safely. If you have balance problems, an indoor trainer can be a useful choice. If you have osteoarthritis or another condition, talk to your doctor about which form of cycling suits you. ^{[1] [5]}

A higher body weight or higher age doesn't call for a separate performance goal. Choose a bike you sit well on and a starting point that fits your current experience. With a higher body weight, also check your bike's maximum load. If you're restarting after an injury, agree the mix of cycling and running with your physiotherapist or doctor; cycling is not a guarantee against injury-related symptoms.

Stop if you get chest pain, dizziness or unusual breathlessness, and seek medical help. Turn back too if cycling hurts instead of getting more comfortable. Choosing another sport only helps if that activity suits your body and your situation. ^[1]

How to start this week

Pick one moment when you would otherwise have run an extra easy loop. Grab your bike, set up a simple route and head off with no speed goal. Keep your next trail in mind: you want to still have the appetite and energy for it. If you like the combination, the bike earns a regular spot next to your running shoes.

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