Coach's Call Sweet Spot 2x10 20 minutes of sweet spot in two 10-minute blocks — the dose rung above the 25-28 minute entries and the short-window sibling of sweet-spot-3x10 (same rep, same intensity, 42 minutes). The most sweet-spot work that fits a 30-minute session. Rep intensity follows the library's rep-length curve. No trial of this exact duration is cited. bike