After a near-death experience—collapsing during a fitness class in a Texas gym—Alvino Santana is thankful to be alive, and knows that each day is a gift. The 56-year-old from Katy almost died last October while teach a kickboxing class in an L.A. Fitness in West Houston. Suffering a cardiac arrest, for a few moments his heart stopped. Despite clinically dying at the gym, Santana was saved thanks to the skilled emergency resuscitation efforts of gymgoers, who shocked him several times with an AED and performed CPR on him. First responders rushed Santana to Memorial Hermann Hospital in Memorial City where doctors continued lifesaving care. When he came to, Santana had no idea what happened. “All I hear is that I was down,” he later told Fox5. “No recollection whatsoever, but I heard that some of the guys over at the gym got to performing CPR on me, slapped the AED …