Second Wind

You feel slightly winded but energized, as if having just run a long distance but knowing you could run farther.

(Spell Compendium, p.182)  
Originally posted on D&D tools

Transmutation

Level: Paladin 1,
Components: V, S, DF,
Casting Time: 1 standard action
Range: Touch
Target: Creature touched
Duration: Instantaneous and 1 hour/level; see text
Saving Throw: Will negates (harmless)
Spell Resistance: Yes (harmless)

When touching the spell’s intended recipient, your breathing returns to normal but you note the spell’s subject heaves a deep, refreshing breath.

This spell removes fatigue from a subject and provides a +4 bonus on Constitution checks for the duration of the spell. If the subject creature is exhausted when you cast this spell, its condition is improved to fatigued.