Sweet Spot Training Explained: The 88-94% FTP Sweet Spot Zone

Introduction

Sweet Spot Training (SST) is a training method popularized by Frank Overton of FasCat Coaching, with intensity set at 88-94% of FTP, sitting between the traditional Z3 and Z4 zones. The concept: get training benefits close to Z4 at an intensity that hurts less, making it the best choice for time-crunched working cyclists.

The Science Behind Sweet Spot

The traditional training pyramid recommends roughly 80% in Z2, 15% in Z3, and 5% above Z4. But for working cyclists who can only train 6-10 hours a week, pure Z2 volume simply isn’t enough. SST offers a compromise:

• Higher intensity than Z2, stimulating the lactate threshold
• Lower intensity than Z4, allowing faster recovery
• Sustainable over 4-6 consecutive weeks
• High TSS accumulation efficiency (roughly 80-88 TSS per hour)

SST Intensity Reference Table (FTP 250W)

Classic SST Workouts

• Basic: 15 min warm-up + 20 min SST + 5 min recovery + 20 min SST + 10 min cool-down (70 min total)
• Advanced: 2 x 30 min SST, 10 min recovery between sets (95 min total)
• Long SST: 45-60 continuous minutes of SST (suited to rolling outdoor terrain)
• Over-Under: 3 min SST + 1 min Z4, repeated 4 times per set

8-Week SST Progression Example

When Not to Use SST

SST isn’t a cure-all. In the following situations, switch to Z2 or Z4 instead:

• 2 weeks before a race: switch to short, high-intensity efforts to maintain neuromuscular sharpness
• Early base phase: build the aerobic base with Z2 first
• After 6+ consecutive weeks of SST: your body adapts and marginal gains diminish, so mix in Z4 sessions
• During accumulated fatigue: when HRV drops or CTL runs too high, return to Z2

Practical Tips

First, the trainer is the best environment for SST — outdoors you’ll hit traffic lights, climbs and descents, making it hard to hold a steady 88-94% FTP. Smart trainers like the Wahoo Kickr or Tacx Neo paired with Zwift or TrainerRoad let you control intensity precisely. Second, for outdoor SST, choose gentle grades — the Pinglin section of Beiyi Highway (3-5% gradient) or the gentle climbs around Guanxi are top picks for Taiwanese riders. Third, SST is not Z4 — misjudging intensity turns it into low-quality Z4, so use a power meter to control it tightly; without one, rely on heart rate (85-88% of max HR). Fourth, insert a recovery week every 4 weeks, cutting SST volume in half to avoid overtraining. Fifth, pairing SST sessions with Zwift or Indieflight videos makes them far less tedious — 2 x 30 minutes feels psychologically much easier than one continuous 60-minute block.

Conclusion

Sweet Spot Training offers the best return per hour invested, delivering training effects close to Z4. For working cyclists who ride 80 km on weekends but can only squeeze out 60 minutes on weekdays, SST is the key to breaking through your FTP plateau. But don’t forget its limits — becoming elite still requires going head-to-head with Z4 and Z5. Treat SST as your main course, Z4 as dessert, and Z2 as the broth — that’s a balanced training menu.

Related Reading

• Sweet Spot Training: The High-Efficiency Method at 88-93% FTP
• The Complete Guide to Sweet Spot Training: The Most Efficient Way to Boost Endurance
• Sweet Spot Training: The Golden Zone for Maximizing Training Benefit in Limited Time
• Sweet Spot Training: Maximizing Benefit at 88-93% FTP