I thought I'd contribute my thoughts on this subject. I'm 46 and have always been overweight.
I'm really not one to go to the gym and doing a prescribed regimen of activities. I'm also not a person who likes to be part of a scheduled sports team due to the time requirement and with my schedule as a free-lance musician and supply teacher, I literally don't know what I am doing the next day. (Also being fat when growing up, I've never been good at team sports anyway.)
I've tried doing laps and/or treadmilling while my daughter has karate lessons but I found that to be quite boring and doing that for 15 minutes sustained seemed like an uphill battle. (Excuse the pun.) I've tried yoga, aerobics, swimming, weights, tai chi, etc. but it never really did anything for me.
But, what I have discovered that I really love and is a healthy activity is hiking with trekking poles in the natural areas around my city.
I've been doing this for a year now and my physical, mental, emotional and spiritual health, has improved greatly. I can get out about 1-3 times per week.
When I have the time, I can easily be moving for 3+ hours and if I choose, I can listen to music while I am at it. I get fresh air, it's usually shaded in the forest, I see animals and plant change with the seasons and occasionally discover an interesting natural or historical artifact (skulls, native stone tools and so on).
As for the hiking poles, I just use some straight branches that I've modified. They give my hands, arms and shoulders a work out and increase the safety factor significantly.
Musically, I've noticed my playing stamina has improved because I'm in better shape and my body is stronger. Plus my head is a lot clearer so I can concentrate better while performing.