The Grand Solidarity Challenge 2026

What if you turned your strides into a great act of solidarity? This autumn, head to Sceaux, in the Hauts-de-Seine, for the Grand Défi Solidaire, a day like no other where you can run, walk, share… and above all support research against multiple sclerosis. This neurodegenerative disease affects more than 140,000 people in France, so it’s important to support research against MS.

You’ve got it: it’s time to lace up for a good cause 😇. The race is organized by and benefits France Sclérose en Plaques! Whether you’re a casual Sunday sprinter, a determined runner or the king/queen of a leisurely walk, you’ll find the distance that suits you perfectly 🧤: 10 km solo to push yourself, 5 km to jog or walk at your own pace, and even a 2.5 km route open to everyone, including wheelchairs, joëlettes or companions ❤️. The little ones also get their moment of glory with a 1 km route just for them—and who knows, maybe they’ll head home with a prize thanks to the raffle planned especially for them 🫶. What’s more, you’ll run through the Parc de Sceaux surrounded by nature 🌳. As for the atmosphere, the Grand Défi Solidaire is a full day to share in a friendly and festive vibe. Group warm-ups 🕺, massages, entertainment 🎤, partner booths—everything is designed so everyone can make the most of it. Even your dog is welcome on the walks, as long as it’s kept on a leash 🐶. You run, you have fun, and you help others: the perfect combo, right? 🤝 If you want to support the good cause but can’t travel across France 🚗, the organizers offer a connected challenge throughout the entire month of October 📲. That way, you can run wherever you want over the distance of your choice and do your bit 🫴.

Once you’ve finished your race, all that’s left is to... explore! 🔄 If you’re out of breath at the very idea of running again, we’ve got a program for you: sightseeing 🔍. Just a few kilometers away by car, you can visit Paris and its countless monuments, museums, Haussmann buildings...😍 But if you want peace and quiet, stay in Sceaux: the town has 120 hectares of parks and gardens, such as the Jardin de la Ménagerie or the Jardin des Félibres 🌳. Perfect for a Parisian-style picnic by the pond! 🗼

So, ready to make your heart beat for a cause that truly matters? 🤗