FTP Improvement Strategies: Annual Periodization of Sweet Spot, Over-Unders, and VO2max Intervals

Introduction

Power (Watts) is the most objective metric for evaluating cycling training effectiveness, and FTP (Functional Threshold Power) is the core benchmark for all power-based training. However, the biggest mistake many riders make in their training is repeating the same stimulus year-round, causing the body’s adaptation to plateau. To break through an FTP bottleneck, the key lies in understanding the physiological mechanisms of different training methods and organizing them systematically according to the annual training cycle.

Physiological Effects of the Three Training Methods

Sweet Spot Training (SST)

Sweet Spot is typically defined as 88–93% of FTP and is the most efficient aerobic threshold training zone. At this intensity, riders can accumulate a large training volume while providing sufficient aerobic stimulus to the body.

Key physiological adaptations:

• Increased mitochondrial density and oxidative enzyme activity
• Increased proportion of fat burning in muscles
• Enhanced cardiac stroke volume

Typical workout: 2×20 minutes (5 minutes rest between sets), or 3×15 minutes, with intensity controlled at around 90% of FTP.

Over-Unders Training

Over-Unders involve repeatedly alternating between 5% above and below FTP (or a larger range), simulating the acceleration and recovery scenarios of a race. The core of this training is to force the body to continuously clear lactate, improving the lactate clearance rate.

Key physiological adaptations:

• Elevated lactate threshold (LT2)
• Enhanced rapid recovery after high-intensity efforts
• Increased muscular buffering capacity for lactate

VO2max Interval Training

VO2max intervals are typically performed at 110–130% of FTP, with each set lasting 3–8 minutes and equal-duration recovery between sets. This type of training directly stimulates maximal oxygen uptake and is a key means of raising the ceiling.

Key physiological adaptations:

• Increased maximal oxygen uptake (VO2max)
• Increased cardiac output
• Enhanced aerobic metabolism of fast-twitch muscle fibers

Annual Periodization Framework

Common Mistakes and Corrective Suggestions

Mistake 1: Jumping into VO2max during the base phase
Many riders start high-intensity intervals in autumn and winter without an aerobic foundation, which makes them prone to injury or stagnation in the subsequent intensity phase. It is recommended to maintain the base phase for at least 8–12 weeks, focusing on SST and Z2.

Mistake 2: Doing Sweet Spot all year round
Although SST is efficient, if you never progress to higher intensities throughout the year, your VO2max ceiling cannot be raised. You need to incorporate Over-Unders and VO2max intervals in the spring.

Mistake 3: Ignoring recovery weeks
Every 3–4 weeks, you should schedule a reduced-volume recovery week (training volume reduced by 30–40%) to allow the body to supercompensate. Skipping recovery weeks is one of the main causes of long-term FTP stagnation.

Practical Recommendations

1. Testing frequency: It is recommended to perform an FTP test every 6–8 weeks (Ramp Test or 20-minute test) to track progress
2. Training log: Use Garmin, Wahoo, or TrainingPeaks to record workout completion rate and TSS for each session
3. Taiwan summer adjustments: High temperature and humidity in summer can reduce outdoor power output by 5–10%; it is recommended to use an indoor trainer for high-intensity workouts during summer
4. SST long-climb simulation: In autumn and winter, riding long climbs such as Wuling or in Yilan naturally accumulates a large amount of SST—this is a geographical advantage for Taiwanese riders

Conclusion

Improving FTP is a systematic project that requires different training methods to play their respective roles at different times. Sweet Spot builds the aerobic foundation, Over-Unders improve lactate processing capacity, and VO2max intervals break through the ceiling—all three are indispensable, and the key is doing the right training at the right time. Establishing an annual periodization plan is the only way to ensure every bit of effort delivers maximum benefit.

Related Reading

• Multidimensional Improvement of Threshold Power: Breakthrough Strategies Beyond Sweet Spot
• VO2max Power Intervals: Designing 3–8 Minute High-Intensity Workouts
• Sweet Spot Training: The Efficient Training Method at 88–93% of FTP
• Sweet Spot Training: The Golden Zone for Maximizing Training Benefits in Limited Time