Good Morning America's Michael Strahan had fans getting a little hot under the collar on Thursday when he posted an athletic photo on Instagram.The TV presenter, 49, asked his followers to caption a throwback photo of him in his American football days and they couldn't get over his athletic frame. MORE: Good Morning America host's weddings and engagements: Lara Spencer, Amy Robach and more!In the photo, Michael was stood with his back to the camera and wearing his NY Giants kit on the field.