Chris Hemsworth has always had an enviable physique. When he first made his debut in Star Trek, the 6’3” actor was toned, yet sleek. When he took on the title role in Thor, however, Hemsworth had to bulk up. The actor focused on weightlifting, but ultimately that proved problematic. “I was, I think, probably a little bigger the first time around, but I felt very stiff and sort of uncomfortable,” he told W. Now, after adding yoga and more cardio into his routine, Hemsworth feels much better. “I feel much more, like it’s useful kind of muscle, functional kind of movement and training.” Want proof? Here’s a look at Hemsworth chiseled abs and bulging biceps through the years.