Personal Shield

Personal Shield is one of the most popular implants for zerglings and skilled players alike. Its effect is simple: It allows you to use your stamina to absorb damage taken at a 1 to 1 ratio. This, essentially, gives you 100 more armor, enough to take an extra sniper bullet or survive that extra second you need to kill an enemy before he kills you. Unfortunately, Personal Shield (or P-Shield, or PS for short) has a tendency to run you completely out of stamina, forcing you to walk and disabling all your implants until you regenerate 20 stamina.

Some players use a strategy combining Second Wind and P-Shield to allow them to absorb even more damage by activating Personal Shield just after Second Wind kicks in.