Strength Training for Endurance: How Often Should You Lift Weights?

For a long time, strength training was controversial in endurance sports. Many runners, cyclists, and triathletes worried that lifting weights would make them slower, bulkier, or too fatigued for their key workouts.

But over the past couple of decades, that thinking has changed. Research now consistently shows that strength training can improve endurance performance by making athletes more efficient, more durable, and more resistant to injury.

The real question isn’t whether endurance athletes should lift weights — it’s how often.

Here’s how strength training fits into an endurance training program, and how frequently most endurance athletes should include it in their weekly routine.

What Is Strength Training for Endurance?

Strength training for endurance focuses on improving muscular strength, stability, and fatigue resistance so athletes can maintain efficient movement over long periods of time.

For runners, cyclists, and triathletes, the goal isn’t to build large muscles or train like a bodybuilder. Instead, strength work is used to support endurance performance by improving force production, joint stability, and movement efficiency.

When muscles are stronger, they require a smaller percentage of their maximum capacity during each stride or pedal stroke. Over long distances, this can translate into improved running economy, better cycling efficiency, and greater durability late in races.

Strength training can also help reduce the risk of common overuse injuries by strengthening connective tissues and stabilizing the joints that absorb repetitive impact.

Why Strength Training Matters for Endurance Athletes

Endurance sports place enormous repetitive stress on the body. Strength training helps prepare your muscles and connective tissues to handle that load.

One of the biggest benefits is injury prevention. Stronger muscles provide better support for the joints, which can reduce the likelihood of common issues like shin splints, runner’s knee, or Achilles problems.

Strength work can also improve movement efficiency. Studies have shown that strength training can improve running economy and cycling efficiency, meaning athletes can maintain the same pace while using slightly less energy. Reviews of the research have also found that incorporating strength training can enhance endurance performance and help athletes maintain better mechanics as fatigue builds.

Finally, strength training helps maintain form as fatigue builds. Late in long races, many athletes struggle not because their cardiovascular fitness fails, but because their muscles can no longer maintain proper mechanics. Stronger muscles delay that breakdown.

How Often Should Endurance Athletes Lift Weights?

Most endurance athletes benefit from one to three strength training sessions per week, depending on the stage of their training cycle.

During the off-season or base training phase, many athletes perform strength training two to three times per week. This is typically when heavier lifts and more structured strength programs are introduced.

As race-specific training begins and endurance volume increases, strength work is usually reduced to one or two sessions per week. At this stage the goal is maintenance — keeping the strength you’ve built without creating excessive fatigue.

During peak race weeks, strength sessions are often shortened or replaced with lighter stability work to avoid interfering with key workouts or recovery.

For most endurance athletes, consistency matters far more than doing long or exhausting strength workouts. Short, well-planned sessions performed regularly tend to deliver the best results.

Best Strength Exercises for Endurance Athletes

Strength work for endurance athletes usually focuses on compound movements that build functional strength across multiple muscle groups.

Some of the most effective exercises include:

• Squats
• Deadlifts
• Lunges or split squats
• Step-ups
• Core stability exercises such as planks or anti-rotation movements

These exercises strengthen the major muscles used in running and cycling while also improving balance and stability.

Unlike bodybuilding programs, endurance-focused strength training typically uses moderate volume and emphasizes movement quality rather than isolating individual muscles.

When Should You Schedule Strength Workouts?

One of the most common questions endurance athletes have is how to fit strength training into an already busy schedule.

Many coaches recommend performing strength sessions after easy endurance workouts or on the same day as harder sessions, leaving a few hours between them to allow for some recovery. This approach helps consolidate harder training stress into the same day, while preserving true recovery days elsewhere in the week.

What athletes generally want to avoid is heavy lifting immediately before key workouts, such as long runs, interval sessions, or demanding bike rides. Fatigued muscles can interfere with performance and increase injury risk.

It’s also important to consider delayed onset muscle soreness (DOMS), which often peaks 24–48 hours after a strength session and can leave your legs feeling unusually heavy, especially if you’re introducing new exercises or lifting heavier than usual. Because of this, it’s usually best to avoid scheduling lower-body strength workouts within 48 hours of your longest run or ride of the week. Planning strength sessions earlier in the week allows enough time for soreness to fade before your key endurance workouts.

Spacing strength sessions strategically within the week helps ensure they support — rather than disrupt — your endurance training.

Common Strength Training Mistakes Endurance Athletes Make

Despite the benefits, strength training is often poorly implemented in endurance programs.

One common mistake is doing too much strength work during peak training. When mileage and workout intensity are already high, heavy lifting can create unnecessary fatigue.

Another mistake is performing bodybuilding-style routines that focus on isolation exercises rather than functional movements.

Some athletes also schedule strength sessions right before key workouts, which can leave their legs too fatigued to train effectively.

Finally, many endurance athletes simply skip strength training altogether. While it’s possible to perform well without it, most athletes benefit from including at least some structured strength work.

The Bottom Line

Strength training for endurance athletes is no longer considered optional. When done properly, it can improve efficiency, durability, and long-term performance.

Most endurance athletes benefit from one to three strength sessions per week, with slightly higher frequency during base training and reduced volume during race-specific phases.

The key is to keep strength training supportive of your endurance work. Focus on compound movements, maintain consistency, and avoid sessions that leave you too fatigued for your primary workouts.

When integrated properly, strength training doesn’t make endurance athletes slower — it helps them become stronger, more resilient, and better prepared for the demands of long-distance racing.