The SUC has "Maintain endurance", a level 3 spell, and "No fatigue", a level 7 spell, both in the "Sustain Body" spell list.
Technically speaking, the "Travelling dance" spells of the Dervish in the RoCo. II may count as well, as the allow the caster "to perform any physical action" at a reduced exhaustion rate (instead of merely running at a given rate, as the many run spells allow to).