Dylan Efron went through a physical transformation during his time on Dancing With the Stars season 34. "Probably TMI but I'm fascinated with this stuff," Efron, 33, wrote via his Instagram Stories as he shared a video of himself stepping on a scale on Tuesday, December 2. "I weighed around 175-178 lbs. (80kg-ish) at the start of DWTS. By week 3, I went down to 170, they had to take in my waist on my pants ... a lot of cardio and wasn't eating." Efron revealed that a change in his diet helped him gain the weight back - and then some.