You can exercise and workout outside. This might also be more enjoyable than working out in your home. There are also certain variables and equipment that you might find outside to make your workouts more challenging like rocks, benches and terrain.
Examples of outdoor workouts are; Hill Runs, Trail Running, Hiking, Walking Lunges, Squats, Sprints, etc. There are tons of workouts you can get in and because you are doing this outside with hills and different terrain you will burn more calories while building muscle at the same time!
Outdoor workouts are my absolute favourite and they are never boring!