With the summer officially at an end, it’s that time when us red-blooded males take our biceps, six-packs and other heavily toned body parts off public display. It’s also that time of year when guys go back to the gym to go #BeastMode so they can get their bodies ripe and ready to show off just in time for next summer. It’s good to stay fit and healthy—but there’s a fine line between celebration and blatant vanity—and there’s no place where that’s more prominent than in the world of Instagram.

Just to point-out, taking a quick pic of yourself in the gym after weeks of effort shouldn’t be frowned upon—so how do we spot the heroes from the shameless narcissists? Here are the seven ways: