Britney Spears Courtesy the Britney Spears/InstagramBritney Spears loves to article her complicated workout routines top top Instagram, but one of her fitness tricks is surprisingly simple: running.

After the Piece of Me singer, who is date fitness model and also Slumber Party music video clip costar Sam Asghari, popped into Equinox’s Precision Running class at Westlake Village, California, recently, Us got to out to the pro that designed the technique to find out why it’s such an effective full body toner. According to David Siik (who teach the June class the Grammy winner popped in on!), the treadmill practice is based upon high soot interval training and incorporates a mix of speed and also hill intervals.

Me and Pres having actually a chilled day at our favorite spot in Miami!