[diafygi]

It takes ~6 weeks to form a habit. So all you need to power through is 1.5 months of consistent exercise, then you will feel weird when you don't exercise.

I've found the best way to get through the first 1.5 months is to go through it with someone. Get a partner to go to the gym with. Find someone who also rides their bike to work. Join a running/fitness club that meets early in the morning several times a week. Etc. It only takes about 30-60 min to exercise enough to be fit.

Also, keep in mind that your mental health depends on exercise. You won't burn out nearly as quickly if you are physically active. Exercise makes the startup life much more sustainable.

[amac]

This is true. Like most human habits, once you establish routine, whatever it is you're doing becomes natural. Running is fantastic as all you need literally is a good pair of running shoes and you're good to go.