Web/iOS: Jerry Seinfeld's productivity secret, a.k.a. "don't break the chain", is a powerful method for developing (or breaking) habits. Chains.cc is a stunningly beautiful tool to track your progress.
Create a chain for any habit you want to keep up and mark it daily so you see the chain grow. You can customise the chain colour and images, as you see above. Unlike other similar tools, you can select days to skip for specific goals. For example, if you only want to run on Mondays, Wednesdays and Fridays.
Chains.cc also has public groups you can join or you could create a private group, so you can get some additional motivational support.
Improve your habits, one day at a time.