July 13, 2026 · 6 min read

Sweet Spot Training (SST) — Is It the Most Effective Method for Amateurs?

The short answer: SST is the most effective method per training hour, but not the most effective method overall. On 4–7 hours a week, sweet spot (88–94% FTP) maximizes threshold stimulus per minute and builds CTL faster than anything else. But comparative research consistently shows that at higher volumes and over the long run, polarized training produces bigger VO2max and FTP gains. SST is a tool for a period and a time budget — not a year-round religion.

Why is SST so popular with amateurs? Because it solves their main problem — lack of time. An hour of sweet spot yields 60–75 TSS versus ~40 TSS of easy Zone 2, it's mentally tolerable (unlike VO2max) and easy to execute in ERG. Session structures are covered in the piece on 60-minute sweet spot workouts — here we ask a different question: is it the optimal strategy, or just the convenient one.

What the research says: SST vs polarized

• Seiler's work and its descendants — in riders training 8+ hours a week, polarized (lots of easy, a little very hard) produces bigger VO2max and threshold-power gains than threshold/SST training.
• But in 4–6 h amateurs — the differences blur: at low volume, "80% easy" means too little intensity in absolute numbers, and SST wins on stimulus density.
• The methodological catch — most studies run 6–12 weeks. SST shines in that window; its weakness (a stagnating aerobic ceiling) shows up later.

Who is SST genuinely the best choice for?

For a rider with a 4–7 hour weekly budget, in the base and CTL-building period — especially in winter on the trainer, and for people targeting long, steady efforts (gran fondos, time trials). If your week is 3–4 one-hour sessions, SST as the core of the plan is hard to beat.

Where SST hits its ceiling

The problem shows after 8–12 weeks of riding "eternal sweet spot":

• No VO2max stimulus — the aerobic ceiling caps FTP (threshold is ~75–85% of VO2max). Without MAP work you push FTP ever closer to the ceiling until progress stops. The fix is covered in 4×8 vs 5×5 intervals.
• Load monotony — every session similar, every one moderately hard; grey-zone risk grows as "sweet spot" drifts into threshold. The contrast with the 80/20 model is greatest here.
• Cumulative fatigue — 3–4×/week SST without unloading weeks drags TSB down for weeks; stagnation is easy to mistake for "needing a bigger dose."

How do you tell SST has stopped working?

Three signals in the data: FTP flat despite rising CTL, EF (power-to-heart-rate) no longer climbing, and a Ramp Test showing MAP barely 110% of FTP — you've reached your aerobic ceiling. That's the moment for a VO2max block, not a fourth sweet spot session. Verify with a Ramp Test every 6–8 weeks instead of believing it will "kick in eventually" — and track EF along the way.

The practical verdict: SST as a phase, not a philosophy

An amateur's optimal year uses SST where it's strongest: October–January as the core of base and CTL building (2–3 sessions/week), then a 6–8 week VO2max block before the season, with SST returning in-season as maintenance between races. Add an unloading week every 3–4 weeks — the rhythm described in block periodization.

Summary

SST is the best stimulus-per-hour ratio an amateur has — and that's exactly why it's so easy to overuse. Use it as a base-building phase on a small time budget, but watch for ceiling signals: flat FTP with rising CTL and a flat EF mean you need a stimulus from above, not more minutes at 90% FTP. The most effective method for an amateur isn't SST or polarized — it's the ability to switch between them based on what the chart shows, not on loyalty to a method.

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