Christopher Schwarzenegger is continuing his weight loss journey. The 27-year-old son of Arnold Schwarzenegger and Maria Shriver could be seen showing off his slimmer figure in a photo shared by sister Katherine Schwarzenegger Pratt on Instagram on Aug. 22. In the image, Christopher wore a white shirt and pink shorts as he looked down at his phone while on a boat. Other images shared in the carousel post showed mom Maria, 69, plus brother-in-law Chris Pratt. Christopher's uncle, Anthony Shriver, was also featured in snapshots, as were what appeared to be some of Katherine and Chris' children. Never miss a story — sign up for PEOPLE's free daily newsletter to stay up-to-date on the best of what PEOPLE has to offer​​, from celebrity news to compelling human interest stories. Christopher previously opened up about his dramatic weight loss transformation while speaking at the Inaugural Beacher Vitality Happy & Healthy Summit in Los Angeles in May. Explaining that slimming down has taken him more than five years, the Vice Chair of the Special Olympics Founder's Council said, "It was a big process." The PEOPLE Puzzler crossword is here! How quickly can you solve it? Play now! "I started in 2019, when I was living in Australia. I was on this big trip. I made it a big [deal] like, 'Oh, I'm going to go out and do all this stuff, be in Australia,' and I just saw how much my weight was prohibiting me from doing the everyday activities," Christopher continued. He added: "I was like, 'I want to go skydiving.' And my friends were like, 'Yeah, no shot.' I was like, 'Yeah, I can't skydive.' " Christopher's insecurity about his weight, he said, began in high school. He used to bring customized lunches to help him eat healthier. "I tried everything. I was doing meal delivery things in high school, and I remember feeling like a weirdo when I was bringing weird lunches to school," Christopher said during the panel. According to Christopher, his weight loss was "not an overnight thing." He added, "It took a lot of trial and error, and even still to this day ... when you're saying, oh, before and after photos ... I don't feel like I'm an after yet. I don't feel like I'm at the point." Christopher said one way he was able to shed so much weight was by giving up bread during Lent — a 40-day Christian religious observance. "I lost 30 lbs. just through that," the University of Michigan graduate, who is also the Director of Development at Indus Valley Media, a Los Angeles production company, recalled.