Theoretical evolutionary tracks in the HR diagram for the 1.5 M_⊙, 3.0 M_⊙, and 6.0 M_⊙ models at solar metallicity following the standard prescription (left panel); and including rotation-induced mixing and thermohaline instability (right panel), from the pre-main sequence up to the end of the TP-AGB phase. Colours depict the mass fraction of ³He at the stellar surface as indicated on the right, with the arrows showing the initial ³He and ³He + ²H content assumed at birth.