Muscle Fiber Density is one of the Gene Mods in XCOM: Enemy Within.
Description[]
Confers superhuman leg strength, enabling the soldier to reach high positions without the need for ladders or other climbing aids.
Acquisition[]
This Gene Mod is unlocked after completing the Thin Man Autopsy research.
Cost: §60, 
25
Notes[]
- Muscle Fiber Density allows a soldier to reach elevated positions without the need of climbing aids. Indirectly it allows a soldier to travel further, especially in alien ships when there are many elevated positions. Combined with Grapple, there's virtually no high ground a soldier won't be able to reach to nestle in or pass by as a shortcut.
- The gene mod is especially useful for moving into elevated firing positions.
- A Sniper with this, Depth Perception, Damn Good Ground and Squadsight can make the most of getting into and using elevated firing positions to their maximum effect until Archangel Armor becomes available; for Snap Shot operatives, this combination remains useful throughout the entire game. For even more aim, a S.C.O.P.E. works extra well.
- In Covert Operations, this gene mod is recommended with a Sniper with Low Profile and Mimetic Skin; this combo also proves extremely useful as most missions have high points and high cover.
- Jumping 2 stories in a single move will grant the "Mind the Step" achievement. This can be done, for example, from the ground to the roof of a tall building.