Lifting isn't a phase; it's a lifestyle. I have a pet theory that there are two groups of gym users: the cardio divas and the lifting bros . Of course, these groups have some overlap. Very few people who attend the gym regularly only do cardio or weights. However, I feel like the weight lifters make going to the gym way more of their personality than the cardio girlies do. No judgment because I totally get why! Gaining takes a lot of upkeep that can kind of take over your life. You have to buy…