Join Robby McKittrick for a look “Beneath the Stats” of Boston’s professional sports teams and personalities in this new podcast.    In the first half of the podcast, Robby speaks with sports psychologist Greg Cartin about the new popular documentary "Free Solo," the "hot hand fallacy," the "clutch" gene, the "yips," home field advantage, and his overall sports psychology philosophy.   In the second half of the episode, SEN America creator, Sirius XM Radio producer, and ESPN Australia writer Christopher Tyler joins the show to vent and rant with Robby about the Celtics' recent struggles.