Simulated CMD of increasing SF over the past 5 Gyr. Important features on the CMD are highlighted: main sequence (MS; green), blue helium burners (BHeBs; blue), red helium burners (BHeBs; red), asymptotic giant branch (AGB; orange), red giant branch (RGB; magenta), and red clump (RC; cyan). For the MS, BHeBs, and RHeBs we overlay the logarithmic ages of stars at a given magnitude (Marigo & Girardi 2007).