Sam Asghari, 27, opened up about how he keeps Britney Spears, 39, happy in an interview with Men’s Health published on Monday, Sept. 13, just one day after the lovebirds announced their engagement. Sam posed shirtless for a number of awesome action shots for the interview, and while speaking to the publication, the fitness trainer explained his secrets to fulfilling the “Toxic” singer’s happiness in the five years (and counting) of their relationship.