I think that anyone in reasonable shape should be able to do it. Walking several miles at a time a few days a week would help. A good pair of runners that are broken in a bit (no blisters) are essential.
A camel pack type hydration system is also a good idea. My ex-wife was overweight, and diabetic yet entered the Honululu Marathon, walking, several years ago to raise money for some cause, she finished in eight hours without a problem.
While teenagers should be well able for the exertion required, younger children will find some of the ‘ways’ too challenging. So Follow the Camino will help you choose a route appropriate to your family’s capabilities. Before you set off, it might be a good idea to remind your children of the significance, religious and otherwise, that the Camino has for many walkers.
It is also important to motivate your children at the beginning. Everyone finds the first few days hard and there can be a temptation to quit.
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