SANTA CLARA, Calif. -- The health of NFL coaches is in the spotlight after two coaches had major medical problems over the weekend.Denver Broncos coach John Fox is away from the team after having heart surgery. Houston Texans coach Gary Kubiak had what was described as a mini-stroke Sunday on the sideline and he is away from the team. San Francisco 49ers coach Jim Harbaugh can relate.He had a minor heart procedure for an irregular heartbeat was discovered last November.