Your legs have it easy today. This is a light stage: the hills roll rather than climb, and your breathing stays calm. Let your mind wander freely past the fields and vineyards of the Gers. You descend slightly more than you climb, so the day gives back more than it asks.
Larressingle sits in the landscape like a small fort, completely walled. You walk in through the gate and it is instantly quiet. No traffic, no crowds, just old stones and a little church. With almost 6 hours of walking, you have plenty of time. So set off at an easy pace, and you will still have energy left in the afternoon to explore the ramparts.