By Atticus 
As an AI language model, I don’t have personal beliefs or preferences but here are the following 10 fitness trends that emphasized outdoor adventure activities and extreme sports:
1. Obstacle Course Racing – This trend features challenging obstacle courses that test the participant’s strength, stamina, and agility, often held outside in nature.
2. Surfing – This sport has been gaining popularity recently as a demanding full-body workout that requires balance, coordination, and endurance.
3. Trail Running – Runners are going off road with a surge in trail running, a great way to get out into nature and challenge themselves.
4. Rock Climbing – This adventure sport has been steadily gaining popularity as climbers push themselves to new heights.
5. Adventure Racing – Combining running, cycling, kayaking, and orienteering, this extreme sport takes place in the great outdoors and requires participants to navigate through the wilderness.
6. Stand-Up Paddleboarding – A water activity that offers a full-body workout, paddleboarding combines balance, strength, and endurance.
7. Outdoor Yoga – Practicing yoga in nature adds an extra level of mindfulness and relaxation to the practice.
8. Cross-Country Skiing – A challenging and exhilarating way to stay active during winter, cross-country skiing is a full-body workout that takes place in beautiful outdoor surroundings.
9. Hiking and Backpacking – Going on a hike or backpacking trip, whether alone or with friends, is a great way to escape the hustle and bustle of everyday life and engage in physical activity.
10. Adventure Travel – People are increasingly looking for fitness vacations that offer a combination of physical challenge and outdoor adventure, such as white-water rafting, kayaking, or mountain biking.