Leg day is a mysterious day that most beginner lifters don't know about. The more expreienced lifters only include leg day for the simple fact that they don't want to be featured on the next "never skip leg day " meme

One who has a mania for music.

The worst day of the week. Sucks because you would rather be hitting arms, or shoulders, or chest, or even back, but you are stuck working the part of your body that shows the least. Usually involves a large amount of walking around, stalling, and hype. If you skip leg day, you will be deemed a bitch and be called such from then on out. Best pump, but usually involves the most work

traditional known as rest day / modernly known as arm day

A day in which you work the lower half of your body until you cry blood, it is the ultimate way of proving that there is no God.

100% concentrated hell on earth. Will leave you sore for the rest of the week and will make you weak in the knees.
It's worth it though and if you skip it, it's justifiable to call you a homosexual.

A special day of the week that jd does not participate in. Hence why he has chicken legs.