Century Ride: 4-Hour Endurance Bike Session

Session Overview

A century ride — 100 miles (160km) — is a milestone goal for many cyclists and triathletes. This structured 4-hour endurance bike session builds the aerobic base, muscular endurance and pacing discipline needed to tackle that distance with confidence. It is designed for advanced cyclists who can already comfortably complete 3 hours on the bike.

What You'll Need

• Road bike or triathlon bike in good working order
• 3-4 bidons (water bottles) and a solid hydration plan
• 4-6 energy gels or equivalent (60-80g carbs/hour)
• Spare inner tube, mini pump and tyre levers
• GPS device with heart rate and/or power data

Warm-Up (20 minutes)

Begin with 20 minutes of easy riding at Zone 1-2 (conversational pace, RPE 3-4). Focus on smooth pedalling, a high cadence of 85-90rpm, and checking that nutrition and equipment are within easy reach. Do not skip this step — going out too hard from the start is one of the most common century ride mistakes.

Main Set

The main session is structured as a progressive Zone 2 endurance ride with two brief harder efforts to build fatigue resistance. Consume 60-80g of carbohydrate per hour and 500-750ml of fluid per hour throughout.

• Minutes 20-80: Steady Zone 2, RPE 5-6, cadence 85-90rpm — build gradually into the effort
• Minutes 80-85: 5-minute Zone 3 effort (RPE 7) — simulate a short hill climb or race surge
• Minutes 85-160: Return to Zone 2 — maintain pace as fatigue accumulates; this is where the session earns its gains
• Minutes 160-165: Second 5-minute Zone 3 effort — final push before the cooldown
• Minutes 165-220: Easy Zone 2 to complete the session — keep the legs moving smoothly

Cool-Down (20 minutes)

Spend the final 20 minutes at Zone 1 (easy spin, RPE 2-3). Reduce intensity gradually and begin your post-session recovery plan. Eat within 30 minutes of finishing — carbohydrates and protein to replenish glycogen and start muscle repair.

Coaching Notes

• Pacing is everything: start at RPE 5 and build to RPE 6 — never exceed Zone 3 on a century training day
• Eat before you feel hungry; drink before you feel thirsty — both signals arrive too late on long rides
• Increase weekly long ride distance by no more than 15-20% per week to avoid overreach injury
• Scale down: beginners should aim for 2.5-3 hours with one shorter Zone 3 effort instead
• Scale up: add a longer Zone 3 block or include sustained climbs to simulate your target course