Glossary: Sweet spot training

What sweet spot is

Sweet spot is a training intensity band sitting between tempo and lactate threshold, roughly 86 to 96 percent of FTP (or CP, for athletes using the CP model). It produces the highest sustainable training stress per unit of fatigue in most cyclists.

In the Yousuli zone model this band is Zone 3b in the FTP-anchored time-in-zone scheme. See Glossary: zones.

Why it works

Sweet spot intensity:

• Is below LT, so blood lactate stays sub-critical. You can sustain it for 20 to 60 minutes.
• Is above tempo, so it pushes adaptations associated with raising the lactate threshold.
• Carries lower fatigue cost than threshold or VO2 work, so you can do it more often.

The result: more weekly training stress without the recovery cost of full-threshold sessions.

Typical session formats

• 2 x 20 min at 88 to 92 percent of FTP.
• 3 x 12 min at 90 to 94 percent of FTP.
• 4 x 8 min at 92 to 96 percent of FTP.

Total work in zone is the key metric, typically 30 to 60 minutes per session for a 70.3 or full-distance athlete in build phase.

When to use it

• Base to build transition: bringing intensity back after long aerobic work.
• Time-crunched plans: sweet spot delivers the most Load per hour available.
• 70.3 and 140.6 specificity: race-pace bike efforts for long course sit in this band for many athletes.

When to skip it

• Pure base block when you want to keep intensity low.
• Peak / taper when you should be doing threshold or VO2 work, not sweet spot.
• Recovery weeks.

What the Hub does with sweet spot

Time-in-zone analytics on bike activities bucket time spent in 3b separately from 3a (the lower endurance band) so you can see how much sweet-spot work the athlete actually did in a given week. See Activity FIT parser metrics.