Lester Holt previews his new podcast "Before and After" with an interview featuring professional ballroom dancer Adrian Haslett. Haslett recounts her harrowing experience being just two feet from the Boston Marathon bombing, describing the immediate sensory loss and chaos. She reveals a pivotal secret that helped her survive: a determination not to die like her birth mother. The episode explores her journey from the traumatic event to her recovery and continued life as a dancer.