Britney Spears is getting pumped for those hot summer days! The 37-year-old singer is back in the gym and has the upcoming season in mind. The mom of two (who is a pro in the gym) goes through a solid workout in the video, set to Nicki Minaj’s “Chun-Li.” Spears starts off with some stretches before doing medicine ball squats, leg raises and bicep and tricep curls.