A higher FTP makes everything easier. The group ride you used to hang on to becomes comfortable. The hill that broke you becomes manageable. The gap between you and the riders ahead gets smaller.
But FTP doesn't go up by accident. You need a plan.
What actually limits your FTP
Three things:
- VO2max (your aerobic ceiling). If this is low, your FTP can't grow past a certain point no matter how much threshold work you do.
- Lactate threshold (how much of your ceiling you can sustain). Elite riders operate at 85-95% of VO2max at threshold. Recreational riders often sit at 70-80%.
- Efficiency (watts per liter of oxygen). This improves slowly with years of riding.
Different workouts target different limiters. The key is knowing which one is holding you back. If you're not sure, the safe bet is to work on all of them.
The 3 workout types that build FTP
Sweet spot intervals (86-95% FTP)
The most time-efficient option for most riders. High stimulus, manageable fatigue. You can do more total work at sweet spot than at threshold because the recovery cost is lower.
- Starting point: 2x15 min at 88% FTP, 5 min recovery
- Progression: 3x15 min at 90% FTP
- Advanced: 2x30 min at 92% FTP
More detail in the sweet spot training guide.
Threshold intervals (95-105% FTP)
The classic FTP builder. You're riding at or slightly above your current threshold, forcing your body to adapt.
- 2x20 min at 100% FTP, 5 min recovery. The bread and butter.
- Over-unders: 3x12 min alternating 2 min at 105% and 2 min at 90%. These teach your body to clear lactate while still working hard.
Threshold intervals should feel like concentrated, sustained suffering. Not explosive. Not comfortable. Just hard, the whole time.
VO2max intervals (106-120% FTP)
These raise the ceiling. Your VO2max determines how high your FTP can eventually go. If you've been doing threshold work for months and your FTP won't budge, this is probably your limiter.
- 5x4 min at 110-115% FTP, 4 min recovery
- 3x8 min at 106-110% FTP, 5 min recovery
VO2max work is the hardest type of training. Your lungs burn, your legs scream, and every interval feels worse than the last. Limit it to 1-2 sessions per week.
A 12-week plan
Weeks 1-4 (Base). Build aerobic volume. 2 sweet spot sessions per week, rest is Zone 2. Increase weekly hours by 5-10%. Week 4: recovery week, cut volume 40%.
Weeks 5-8 (Build). Add threshold work. Replace one sweet spot session with 2x20 threshold intervals. Add one VO2max session. Week 8: recovery week.
Weeks 9-12 (Peak). Maximize intensity. 1 threshold session, 1-2 VO2max sessions, 1 sweet spot session. Week 12: retest FTP.
Realistic expectations
- Untrained beginner: 15-25% improvement in the first 6 months
- Trained recreational rider: 5-10% per year
- Competitive amateur with 3+ years training: 2-5% per year
- Elite rider: 1-2% per year. Every watt is a fight.
The mistakes that keep people stuck
All intensity, no base. Intervals only work on top of an aerobic foundation. Without Zone 2 volume, your body can't absorb the intensity. You end up tired but not faster.
No recovery weeks. Adaptation happens during rest. Every 3-4 weeks, cut volume by 40-50%. This feels wrong. Do it anyway. Read more about why recovery matters.
Too many hard days. Three quality sessions per week is the max for most riders. Two great sessions beats four mediocre ones every time.
Trying to build FTP while cutting calories. You can't adapt to training you don't fuel. If you're losing weight and building power at the same time, one of them is going to stall. Fuel your training.