Strength training for triathletes and endurance athletes

Do triathletes and endurance athletes need strength training?

Mostly yes. A systematic review of 26 studies in well-trained endurance athletes found that adding strength training improved time-trial performance, economy, power at maximal oxygen uptake and endurance-specific muscle power. The evidence is not identical in every trial, so treat lifting as a well-supported addition, not a guarantee.

Two studies looked at triathletes. In 15 triathletes, two heavy lifting sessions a week for 14 weeks improved running economy beyond the endurance-only group. In 25 long-distance triathletes, 26 weeks of lifting improved cycling economy in the first half and running economy in the second, with no change in the endurance-only group.

Not every study agrees. In 19 well-trained female endurance athletes, heavy leg lifting twice a week for 11 weeks raised leg strength by about 40 percent but changed neither running economy nor a 40-minute all-out run. A survey of 390 long-distance triathletes found that 54.6 percent lifted. The most common barriers were lack of time (53.1 percent) and not knowing how to progress (52.5 percent).

Which lifts help runners, cyclists, swimmers and triathletes?

Squats or leg press, hip hinges, single-leg work and pulls cover most of what endurance athletes need. A review of runners and cyclists found that running economy improves with heavy or explosive lifting, while heavy lifting is the better choice for cycling economy. The table below is our recommendation.

For swimmers the research is less clear. A systematic review of 27 studies in competitive swimmers found no consensus on which strength method works best, but swimming plus strength training seemed to beat swimming alone. If you also race fitness races, the strength training guide matches lifts to each station, and the fitness race and triathlon guide shows what the two sports share.

How often should an endurance athlete lift?

Lift twice a week in the off-season and base, once or twice in the build, and once in the racing season. These numbers are our recommendation. They sit below the ACSM figure of 2 to 3 days a week for novice lifters, because swimming, riding and running already use your recovery.

• A 26-week triathlete trial moved from 8 to 12 reps at up to 75 percent of one-rep max (weeks 0 to 12) to 1 to 6 reps at 85 percent or more (weeks 14 to 26). Our table follows the same direction, with fewer heavy sets.
• In elite cyclists, lifting 1 to 2 days a week for 25 weeks (3 sets of 4 to 10 reps) improved strength and cycling power more than endurance training alone.
• ACSM suggests raising the load by 2 to 10 percent once you can do one to two reps more than planned.

How do I keep my strength in the racing season?

Keep one short, heavy session a week. In a study of well-trained cyclists, one maintenance session a week for 13 weeks of the racing season preserved the muscle size and leg strength built before it, and their cycling power improved further. The study gives the frequency. The sets and reps below are our recommendation.

Stopping has a cost. In 7 elite cyclists who lifted for 25 weeks and then stopped, squat jump height, maximal aerobic power and 30-second sprint power fell within 8 weeks, compared with riders who had never lifted. Both studies were small, so read them as a pattern, not a rule.

1. Keep the lifts you already know and drop the new ones.
2. Do 2 or 3 lifts for 2 sets of 3 to 5 reps. Stop each set with 2 reps in reserve.
3. Keep the load as heavy as in the build, and cut the number of sets, not the weight.
4. Place the session on an easy day or after a short swim. Do not lift the day before a long ride or a long run.

What does a strength session for endurance athletes look like?

A good session has four or five lifts and takes 40 to 50 minutes in the off-season, then two or three lifts and 20 to 30 minutes in season. These are our sample sessions: tools for you to adjust, not a prescription. Learn each lift with a light load first.

How do I fit lifting around swim, bike and run sessions?

Put lifting on a day that already has a hard session, three hours or more after it, and keep the days before long sessions easy. Avoid heavy leg work the day before a long ride or long run. The week below is our recommendation for an 8 to 10 hour week and is easy to adapt.

Order matters somewhat. A meta-analysis of 10 studies found that lifting before endurance work gave about 7 percent larger gains in lower-body dynamic strength than the reverse. A 2022 meta-analysis of 43 studies found that adding aerobic training did not change maximal strength or muscle size, but did reduce explosive strength, mostly in the same session. So when you double up, put the more important session first. See the weekly training structure guide for how the week fits together, and the brick workouts guide for the run after the ride.

Will lifting add bulk or slow me down?

Probably not at these volumes. In the 26-week triathlete trial the lifting group improved economy with no change in body mass. Our aim is force with low volume, not muscle size. The real cost is tiredness, so keep your key swim, bike and run sessions fresh.

• Keep sets heavy and short, 3 to 6 reps (our recommendation), and leave 2 reps in reserve.
• Keep most of your endurance training easy so that it does not eat into lifting recovery. The zone 2 running guide covers how easy that is, and the triathlon training hours guide covers how much time you have.
• Do not add a lifting session in the week you add a long ride or run. Change one thing at a time.
• Sore legs for more than two days after a session mean the load or the number of sets was too high.

Can Tuffr track lifting next to swim, bike and run?

Tuffr is an iPhone app for athletes who train for fitness races and triathlon. It is not public yet: the closed beta is due by 30 November 2026, and a small group goes first. For lifting, we are building two things.

• A gym log for sets, weights and rest, kept in the same plan as your swim, bike and run.
• Coach AI, which proposes changes to your plan. You see what would change and why, and only what you approve reaches your calendar.