Well, fitness raws manhwa usually showcase diverse workout routines and training methods. The characters might face setbacks and achievements, making the plot exciting. Also, the art might highlight the progress of the characters' physiques over time.
One option could be certain file-sharing websites, but be careful as not all of them are legal or safe. Another possibility is to search on dedicated manga download platforms, but make sure they are authorized to distribute the content.
There are a few websites that offer manga raws, but be careful as some of them might be illegal or have poor quality. One option could be MangaRawz, but make sure to check the legality and reliability.