In Fable 2 Strength is one of three attributes you can level up to determine your character's skills.
Fable 2 Strength Details
Strength is used to power your melee attacks and affects the way your character looks: the more Strength you invest in, the more muscular he or she is.Xbox360Achievements.org: Fable 2 Review (October 20, 2008) There are three skill paths within the Strength attribute: Physique, Toughness and Brutal Styles. Physique increases your damage output while Toughness adds to your maximum health. Brutal Styles adds new attacks and more.IGN: Fable II: Talk Softly and Carry a Big Sword (October 13, 2008) Strength points are gained through using melee attacks to kill enemies, which then drop the Blue Orbs that you'll need to spend to gain Strength.1up.com: Fable 2 New Hands-On Preview(September 15, 2008)
Build Up All Three Attributes
While it's certainly possible to play through the game while focusing on one attribute, The Expert Help at Xbox.com recommends taking a more balanced approach. Unlike other RPGs that tend to reward character specialization, Fable II gives players an ample chance to diversify without being punished. Utilizing all three types of attacks in each combat situation will help you collect enough orbs to level up each attribute, but if one seems to be lagging behind, you can purchase potions to rectify the situation.Xbox.com Fable II The Adventurer's Guide to Albion