1. Running: Running is a simple and effective aerobic exercise, which can be done outdoors or on a treadmill. It can help burn calories and enhance heart and lung function and endurance.
2. Cycling: Cycling is a low-impact aerobic exercise, which can be done outdoors or indoors. It can help burn calories and enhance heart and lung function and endurance.
3. Swimming: Swimming is a systemic aerobic exercise, which can be carried out in outdoor swimming pools or natural waters. It can help burn calories and enhance heart and lung function and endurance.
4. Mountaineering: Mountaineering is a high-intensity outdoor exercise, which can exercise the whole body muscles and cardiopulmonary functions. But we need to pay attention to security issues.
5. Yoga: Yoga is a low-impact full-body exercise, which can be done outdoors or indoors. It can help to relax and enhance flexibility and balance.