There's no set entry route to become an outdoor activity instructor but it may be useful to study a relevant qualification like a Level 2 or 3 Diploma in Skills and Activities for Sport and Active Leisure (Outdoor Education).
This would teach you some of the skills needed for the job. Then you could try to find a trainee job with an activity centre.
You'll also need to get coaching or instructor qualifications approved by the relevant national governing body for each of your sports or activities.
You'll usually need:
- 2 or more GCSEs at grades 9 to 3 (A* to D) for a level 2 course
- 4 or 5 GCSEs at grades 9 to 4 (A* to C) for a level 3 course