Nah, helps keep the forum lively. Much better than the spammers united.
It’s totally alright to draw inspiration from real life photos & videos as a whole. If said actor is freely posting those videos themselves, public settings (ie, it’s not taken from by a jealous ex-lover or overly excited paparazzi photographer), I’d feel those are okay to reference. I’d avoid going hyper detailed, but a general “doing squats” and then “doing pullups” for the routines? A water bottle? There’s so many of those videos out there, trouble nailing it down to any specific one.
For some of my originals, I’ve found… ”nature photos” of models online, used those as a loose reference from time to time, which helps with adding some fleshed out details to my characters.