The myth of junk miles: Are easy rides really useless?

Some riders call anything below tempo junk miles. The idea sounds efficient: skip the easy stuff and do only hard sessions to raise FTP. In practice, that approach leaves fitness on the table and increases injury and burnout risk. Low-intensity volume is the backbone that makes hard work effective.

Easy is not nothing; easy is a training purpose. It builds the engine that lets you use watts when it counts.

What easy miles actually do

Consistent low-intensity riding (Zone 1–2 in a 7-zone model) triggers adaptations you cannot get by intensity alone:

• Mitochondrial biogenesis: more and better mitochondria improve aerobic energy production and raise your sustainable power.
• Capillarization: more capillaries improve oxygen delivery and waste removal in working muscles.
• Fat oxidation: you burn a higher percentage of fat at a given wattage, sparing glycogen for climbs, surges, and the finale.
• Lactate handling: improved clearance and utilization at subthreshold intensities lowers lactate at a given pace and stabilizes heart rate.
• Autonomic balance: parasympathetic upregulation from easy rides helps recovery, HRV, and day-to-day readiness.
• Connective tissue robustness: tendons, ligaments, and small stabilizers get time to adapt without the strain of high torque and intensity.
• Durability: you maintain a higher percentage of your fresh-state power late in long rides and races.

These changes stack with, and amplify, your threshold and VO2 sessions. Most successful plans spend the majority of weekly time at low intensity, with a small but potent dose of intensity layered on top.

How easy is easy? Setting Zone 2 by power, heart rate, and feel

Use multiple cues. Calibrate once, then keep it simple.

Two simple checks during endurance rides:

• Decoupling: compare power to heart rate drift over 60–180 minutes. If power stays steady but HR rises >5–7%, you are under-fueled, overheated, or riding too hard.
• Breathing and tension: shoulders relaxed, soft grip, smooth cadence. If you need to brace, it is not easy.

On hilly routes, cap effort on climbs by power or HR and spin the descents. Let riders go. The goal is time in Zone 2, not average speed.

When to use easy rides (and when not to)

Think of easy rides as three tools: recovery, endurance, and frequency builders.

• Recovery rides: 30–60 minutes at <55% FTP or very light HR the day after hard work. Purpose: promote blood flow and restore range of motion. If you are truly smashed, skip and walk or rest.
• Endurance rides: 90–240 minutes in Zone 2, steady nutrition, minimal surges. Purpose: build aerobic base and durability.
• Frequency rides: short commutes or spins that add weekly volume without stress. Purpose: more quality time in the right zone.

A common weekly intensity distribution that works for many is pyramidal or polarized: 70–90% of time easy, 10–30% moderate to hard. The exact split depends on your training age, goals, and life stress.

Two sample weeks

Time-crunched (6–8 hours):

Mon  Rest or 30–45 min easy
Tue  4x8 min at 95–100% FTP (Z4), 60–75 min total
Wed  60–90 min easy (Z1–Z2)
Thu  6x3 min at 115–120% FTP (Z5), 60–75 min total
Fri  45–60 min easy (Z1–Z2)
Sat  2–3 h endurance (Z2), last 20–30 min steady Z3 if fresh
Sun  60–90 min easy spin or off

Base-building (10–12 hours):

Mon  Off or 45 min recovery
Tue  Tempo endurance: 3x20 min Z3 at low end, 2–3 h total
Wed  90–120 min Z2
Thu  VO2: 5x4 min Z5, 90 min total
Fri  60–90 min Z1–Z2
Sat  3–4 h Z2, cap climbs
Sun  2 h Z2 with 4x8 min low Z4 if fresh

Masters riders and anyone under heavy life stress usually benefit from fewer high-intensity sessions (1–2 per week) and more Z2 volume.

Fueling and pacing your easy days

• Pre-ride: a small carb-based snack (20–40 g) if riding within 2 hours of the last meal.
• On-bike: for 60–150 minutes, take 20–40 g carbs per hour; for 2–4 hours, 40–60 g per hour. Under-fueling turns Zone 2 into a slog with rising HR.
• Hydration: ~500–750 ml per hour depending on heat; include sodium (400–800 mg/h) in hot conditions.
• Cadence: choose a comfortable range (85–95 rpm on flats). Avoid grinding in big gears; keep torque modest.
• Terrain: flat to rolling is ideal. On group rides, sit in and let gaps go instead of spiking power.

Fasted training is a tool, not a lifestyle. Use it sparingly, keep it short, and never compromise quality workouts or overall energy availability.

Common mistakes that create so-called junk miles

• Too hard to recover, too easy to adapt: habitual low-tempo rides on easy days accumulate fatigue without a clear stimulus.
• Racing the group ride: surges to close wheels and chase segments turn endurance into mixed intensity. Save that for hard days.
• Monotony: the same route at the same wattage every day. Vary duration and context. One long endurance ride beats five identical 60-minute spins.
• Under-fueling: decoupling skyrockets, cadence drops, RPE rises. Fuel the work to maintain the intended zone.
• Ignoring fit and technique: easy days are perfect for drills—single-leg focus, high-cadence spins, cornering, and position checks.

How to measure progress beyond FTP

• Decoupling trend: longer duration at <5% power-to-HR drift at a given wattage.
• Lower HR at the same watts or higher watts at the same HR in Zone 2.
• Durability: ability to complete quality intervals late in a long ride without a big drop in power.
• Submax lactate (if you test): lower lactate at the same subthreshold watts.
• Subjective: lower RPE for the same pace, faster recovery between hard days, improved sleep and mood.

The bottom line

Easy rides are not junk. They are the fertile ground where your aerobic system grows. Combine 1–3 targeted hard sessions with generous low-intensity volume, fuel appropriately, and you will see steadier power, higher FTP, faster recovery, and better late-race legs. If in doubt, keep easy days easy and make hard days count.