How to choose your first ultra-trail (50 or 100 km)?

Succeed at your first step into ultra
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How to choose your first ultra-trail (50 or 100 km)?

For your first ultra (50 to 100 km), choose a race suited to your experience, well marked and with plenty of aid stations, with little self-sufficiency required. Favor beautiful, motivating scenery and a reasonable elevation gain. Then focus everything on preparation, effort management, and gear tested in training.