Bungie released the Shaxxercise mix tape recently, which the players can encounter during an Exotic quest. The thing is many of us already did the quest but missed this masterpiece so here is a quick rundown on how to listen to the workout tune.
Shaxxercise is one of the easter eggs or just kooky details in Destiny 2 that is akin to Zavala's knitting. It is probably the Vanguard's stoic and always serious attitude that makes him the perfect target for all the jokes Bungie throw around.
The Exotic quest, In Rides the Pale Horse, through which you get the Fourth Horseman shotgun is no exception. Upon picking the quest up from Zavala, you will be sent to retrieve something from his vault. However, trouble arises when you find out that the vault can't be opened as the Vanguard access has been revoked.
In order to get to the famous mixtape, however, you will need to trackback. It is actually located in Zavala's office, not the vault. You will recognise the office along the quest's road to the vault by spotting the giant windows that provide a nice look at the Last City.
The mixtape is located immediately to your left as you enter the office. It is placed on a shelf that is out of your reach, next to Zavala's dumbbells and the only way to see it's actually there is to jump next to the shelf, which will momentarily show the interact button.
In order to climb the shelf and play the tape, you will need to move to the right side of it and climb the golden object that looks like a vinyl record player. From that vantage point, you can jump on the shelf and proceed to the dumbbells, where you can interact with the tape and play the awesome tunes.
After that, you can jam to Shaxxercise in Destiny 2 or just go to YouTube if you want a more practical way to play the inspirational music while working out in your room. Here is the video released by Bungie.