What kind of meditation? How did you start practicing?
For dealing with the stresses of an entrepreneurial lifestyle, I find Pranayama to be a very valuable tool. It is a style of deep abdominal breathing in slow, measured rhythm. Often, when I am stressed, my breathing gets shallower, and I find Pranayama an excellent way for me to reclaim my breath, and with it my sense of inner calm. There are iOS apps and YouTube videos which can help you learn.
Sitting meditation also helps me stay calm and centered throughout the day, and also gives me something like the mental equivalent of clearing my desk to start the day.
I find running and yoga to both be meditative in nature, they are excellent ways to counter the often sedentary lifestyle that we have as technology entrepreneurs.
I'd say making love and recreational driving also confer meditation-like benefits when approached with a certain frame of mind.