There were several posts [1][2] related the benefits of exercise and the comments were filled with interesting discussions about different types of exercises and their benefits. I am curious to know how readers of HN exercise and how it has benefited them personally.
[1] https://news.ycombinator.com/item?id=34515421
[2] https://news.ycombinator.com/item?id=34206115
My recommendation would be to find an exercise that you enjoy doing, do it often enough to improve your health, and take your time; don't rush it. If you injure yourself it'll set you back to the beginning.