Wow, not only she is wife material she is also a good partner for training, she is honest with herself, she is not dense and she is not desperate for attention from MC. The fmc has a pretty nice characterization, what a waste for a harem manga, really too bad this is one of those, this girl would be really good for a fluffy romance without these rivals things :/
Also, I understand he is not athletic but this is pathetic... 4kg dumbbells?!
btw, after that "intense" training, they are going to classes without a shower?