What makes you say this? I always feel fantastic and motivated after a hard session in the gym. I agree that long runs or walks yield more creative thoughts than time in the gym, but few things are as energizing and motivating as successfully grinding out heavy sets of squats or deadlifts.
Thriptic, you didn't bring to the table any thought that isn't criticism... which is fine but you also don't back it up which is what you are criticising this fellow for.
FYI the above is my opinion.
This comment was heavily edited relative to what I responded to
Isn't weight lifting more like doing a 40m sprint, then slowly walking back to do it again?
Do you really want to go down that road? https://www.youtube.com/watch?v=BKorP55Aqvg