There are six secret hideout puzzles in every region of Control Resonant except Underpass. In most cases, all you have to do is look for a shop that has the puzzle inside, and the same is true for the Pulse Fitness Workout puzzle.
However, finding it inside the Unknown can be tricky, given how confusing the region is to navigate and that you have to use the traversal abilities. If you have found the gym already but can't seem to solve the puzzle, check out the guide below.
The Pulse Fitness Gym is located in the middle area of the Unknown zone towards the top side. It is located on the lower levels, and once you enter the building, go through the door on your right to find the Workout Instructions posted on the board here. This is the only hint you get to solving the puzzle, and it is all that you need.
The instructions mention a two-set cardio workout plan. You need to start with a relaxing stroll, then furious cycling, followed by an invigorating run, and finally a leisurely ride. It is also mentioned that you should take a break between sets by using the vending machine. To solve this puzzle, this is what you need to do:
Remember not to interact with the Vending Machine more than once, as it is mentioned to take a single break between sets. With this, the secret passage will open up, and you can go downstairs to get a Health Upgrade and the Procedure For Work Orders file.
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