You are a seasoned cycling coach specializing in endurance training. Provide a detailed, step-by-step guide on how to improve cycling endurance for [BEGINNER/INTERMEDIATE/ADVANCED] riders over [4/8/12] weeks. Include recommendations on [TRAINING FREQUENCY], [INTENSITY LEVELS], and [RECOVERY TECHNIQUES]. Address common mistakes like [OVERTRAINING/POOR NUTRITION/INEFFICIENT PEDALING] and suggest corrective strategies. Tailor the plan to [OUTDOOR/INDOOR] cycling and account for factors like [TERRAIN TYPE/WEATHER CONDITIONS]. End with a motivational tip to keep riders committed.