How do I build endurance for cycling?

What type of cycling are you doing, road or mountain biking? Because it changes the approach a bit.

The thing is, long rides at a steady pace are definitely the foundation, but a lot of people do them wrong. They start too fast and burn out after two hours. Endurance really builds when you stay in a zone where you can talk without getting out of breath - sounds simple but it works. Getting better isn't just about increasing distance any way you want; you need to let your body adapt its aerobic metabolism. Starting with 1h30 to 2h regularly, then adding 15-20 minutes every two or three weeks, is smarter than jumping into a 100 km ride the moment you feel motivated.

Where I differ a bit from what people usually say is that intervals help a lot but they're not the first thing to work on. If you're already struggling to hold 1h30 without cracking, doing intervals is just going to wreck you. Better to first build a solid aerobic base with those easy long rides, and only then add some intensity work - like once a week with progressive accelerations or tempo rides. That builds endurance in a more balanced way and you reduce the risk of some stupid injury that sidelines you for three weeks.

What people often lack is patience with recovery. You can do long rides every Sunday, but if you're not sleeping enough or you're neglecting active rest days, your body won't make progress. Endurance is built as much off the bike as on it.

One other thing: vary the terrain and hills rather than always doing the same flat route. It works different muscle groups and your cardiovascular system adapts better. Plus it's less boring mentally, honestly.

Nutrition and hydration during rides is really something you can't overlook if you want to improve 🚴 I noticed that when I started doing longer routes, I'd hit a wall around km 60-70 because I'd burn through my energy reserves and get completely dehydrated. Once I started taking energy bars or dried fruit with me and drinking regularly, those same distances felt way less exhausting - the difference was crazy. It might sound obvious but it's something a lot of people forget about when they're just focused on racking up the miles.