Your training start in triathlon: consistency over speed, learning each discipline, your first brick and rehearsing the transition dry.
How do you start training for triathlon? Honest answer: with consistency, not speed. In the first weeks it's not about being fast but about getting your body used to the triple workload — swim, bike and run regularly, but easy. Push too early and you get tired or injured instead of better.
This isn't laziness, it's the method of the pros: in an analysis of 175 training distributions, over 60% of endurance training sat in the low, easy intensity zone in 91% of cases. Easy is the foundation everything else grows on. This guide gives you the concrete first exercises — from your first easy loop to your first brick run. The plan is deliberately simple: few, regular, mostly easy sessions in which each discipline has its place and the transition is rehearsed from the start.
Plan three to five easy sessions a week across all three sports. Keep the pace at a level where you could hold a conversation — over 60% of your training belongs in this calm zone. Regularity clearly beats a few hard sessions.
Before you combine them, build confidence in each sport. Swim a few calm, steady lengths, ride relaxed loops, run easy at a comfortable pace. The goal is feeling good in the movement, not a personal best — that comes later on its own.
Now you combine: run 5 to 15 minutes easy straight off a relaxed bike session (a coaching-side practice recommendation). That's how you learn the "heavy legs" feeling — it's measurable, since your running economy is 1.6–11.6% more costly in the first minutes off the bike. Shorten your stride and stay calm. Important: the first brick should show you the switch, not exhaust you — pick a flat, safe loop and stop while it still feels easy.
Lay out your gear the same way in the garden or hallway and run through the sequence: dismount, helmet off, change shoes, run. The golden rule as a practice standard: helmet on first, off last. A few dry rehearsals save a lot of time on race day.
Increase your running volume especially cautiously. Running is the most injury-prone discipline in triathlon and causes 45–92% of injuries. Better a little more each week than big jumps that overload your body.
Keep a simple training log from day one — just duration, sport and how you felt from 1 to 10. After four weeks you'll see in black and white whether you really train easy or secretly go into the red too often. Most beginners underestimate how much slower "easy" should be — your log makes it honestly visible.
Brick means training two disciplines back to back, almost always bike then run. To start, a 5- to 15-minute easy run straight off a relaxed bike session is enough. That's how you get used to the heavy legs that are completely normal in the transition.
Three to five easy sessions are plenty, spread across swim, bike and run. More important than the number is training regularly and mostly easy — over 60% in the calm zone. Consistency builds the base that speed later grows from.
No. Speed comes later and from a solid base. At the start what counts is easy, steady training so your heart, muscles and tendons adapt to the triple workload. Too much speed too early leads to fatigue and overload rather than progress.
The costly feeling sits mostly in the first running minutes, then running normalises. With each brick session the phase gets shorter and more controllable as your body adapts to the transition.
Build an easy base in all three disciplines over several weeks, keep over 60% of training calm and add a short weekly brick. Rehearse the transition dry and build the run especially gently, since it's the most injury-prone discipline. Train consistently and patiently and you'll reach the start relaxed rather than overwhelmed.
Triathlon: Core Technique Deepdive