✔ 最佳答案
Swimming mentioned above can be indoor.
The below activities, i believe, should mostly be taken outdoors:
1. windsurfing
2. rock climbing
3. wild camp
4. canoeing
5. hiking / orienteering
6. horse riding
7. skiing
8. cross-country racing or cycling / marathon
9. rowing (not talking about machine in the Gym)
10. Football
11. Tennis
12. Baseball / softball (mostly outdoor)
13. Fishing
14. Hunting
15. Bungee-jumping / sky-jumping