Colorado football coach Deion Sanders is improving in his battle with an unspecified health condition, his eldest son said.Deion Sanders Jr. posted a video of his father fishing at his Texas estate to YouTube on Saturday.”It’s a beautiful thing,” Deion Sanders Jr. says in the video. “Coach Prime back active, moving around. God is great. Not back active moving around, but it’s progress.”In the video, the elder Sanders, 57, is shown driving the fishing boat, which also counts former Colorado star and Jacksonville Jaguars rookie Travis Hunter among the passengers.Neither Sanders nor Colorado officials have given specifics about the nature of the health issue the coach is facing. He has been away from Boulder, missing annual youth camps he normally would have attended. He is scheduled to attend a Big 12 preseason media event on July 9 in Frisco, Texas.Sanders addressed his health in a social media post on June 11.