438a3a28_es___Dungeons_and_Dragons_Wiki__Perk_Benefit
[Perk Name] Marathon [Pro Perk Benefit] You gain a climb and swim speed equal to 1/2 your normal movement speed. [Perk Benefit] 
You gain a +4 bonus to Endurance, Climb, Swim, and Jump Checks
CoDnD- Call of Duty 3.5 (3.5e Sourcebook)/Chapter 2: New Rules - Dungeons and Dragons Wiki
Perk Benefit