Many of the drills Coach Davis and the high school team demonstrated in the coaching clinics are from Bethel University's Basketball webpage.  Please click on the link below and scroll to the bottom of the page for their practice videos.  If you are looking for some man to man defensive drills the first few minutes of the Defensive Breakdown video has "shell" drills that can be used to teach any age group the basics of seeing your man/seeing the ball combined with help side and ball side defense.  There are many other team and individual skills videos on this website that could be used in your Rec League practices.