so hopefully it will be another good installation.

Wonder if he stays that buff all the time or just gins it up for a roll?
Must take months.

and there was a back shot (if it was even him) of him getting out of a shower many many months into being stranded on Mars - and he was scrawny. Might not have been him, though.

I'd think there was some 'muscle memory' for getting it back, even if you let yourself go a bit. But it may just be easier to stay that way (or 70% or so) most of the time rather than have to huff and puff and get it all back again for each role.