How to Improve Leg Strength and Endurance for Running and Cycling

By Barbara Lewin, RDN, LDN Sports and Functional Nutritionist

Introduction

If your legs give out before your breathing, you are not alone. Many runners and cyclists are limited by their legs, not their lungs.

The good news is this can be improved with the right training, fueling, and recovery.

Why Your Legs Matter Most

Your legs do the work in both running and cycling. If they are not strong or do not have enough endurance, performance will suffer.

Common signs your legs are the limiter:

• Legs feel heavy early
• Muscles burn quickly
• You lose power or pace
• Breathing feels okay, but legs are done

Build Stronger Legs

Strength training is one of the best ways to improve performance.

Aim for 2 to 3 sessions per week.

Focus on:

• Squats
• Lunges
• Step-ups
• Deadlifts

Start with bodyweight, then add resistance over time.

Stronger muscles help you:

• Produce more power
• Delay fatigue
• Reduce injury risk

Improve Muscular Endurance

Endurance is just as important as strength.

For runners:

• Add longer, steady runs
• Include some hills

For cyclists:

• Ride at a steady pace for longer periods
• Add hill climbs or resistance work

This trains your legs to keep going without tiring as quickly.

Fuel Your Muscles Properly

This is where many athletes fall short.

Your muscles rely on glycogen, which comes from carbohydrates.

Perceived exertion and perception of fatigue along with mental acuity is directly related to muscle glycogen stores.

When glycogen is low:

• Legs feel heavy
• Effort feels harder
• Performance drops

To support your legs:

• Eat carbohydrates before workouts
• Fuel during longer sessions
• Refuel after training

Simple options include:

• Toast with honey
• Bananas
• Rice or potatoes
• Sports drinks during longer efforts

Do Not Ignore Recovery

Your legs need time to recover and rebuild.

Without recovery:

• Muscles stay fatigued
• Performance stalls
• Injury risk increases

Focus on:

• Sleep
• Rest days
• Light movement on off days

For more on this, see my article on How Athletes Can Improve Recovery Between Workouts.

Be Consistent

Improvement does not come from one hard workout. It comes from steady, consistent habits.

Stick with:

• Regular strength training
• Consistent endurance work
• Proper fueling
• Good recovery

Key Takeaways

• Strong legs improve both running and cycling performance
• Muscular endurance helps you go longer without fatigue
• Fueling plays a major role in how your legs feel
• Recovery and consistency are essential

Next Step

If your legs are limiting your performance or you feel stuck, this can be improved with the right plan.

Learn more or schedule a Special Introductory Session here:
https://sports-nutritionist.com/nutrition/special-introductory-session/

MAKE THIS YOUR BEST SEASON EVER!