Justin Timberlake burns Thanksgiving calories doing push-ups with son Silas, two, on his back

Justin Timberlake figured out the perfect way to work off those Thanksgiving calories. One day after taking to Instagram to show off his kitchen skills, the pop star used social media how son Silas helps him workout Saturday. The former Mouseketeer, 36, shared a video of himself doing push-ups while his two-year -old laid on his back, telling followers: “Shaking off those leftovers like”... The happy dad continued his caption, writing: “Hope everyone had…