Is it possible to attain a physique like Alan Ritchson from Reacher without steroids?

Yes, for a short time, but you must have the genetics to do so. Henry Cavill does not do any form of steroids and has a great physique — and also exceptional genes. Even without that genetic advantage, though, you can still look quite good. Hollywood bodies are never quite real, however, absent even steroids. For any shirtless scene in an action movie, the male leads are dehydrated and have usually done a quick workout beforehand to make their muscles blood-filled.

About a year ago, my muscles were most impressive-looking after I was quite sick and lost some weight from not eating. That was despite me being weaker than normal. This comment is also correct.

If you gave me a month, I could look extremely shredded and lean. But it’s not sustainable and in fact actors do not sustain it. They plan for it and back off it when it’s not required for a scene as it is not healthy. Remember that anything you see on a screen is not reality, nor is it meant to be; films and shows are the collective dreams of our society.