Maintain your meditation by committing to very short periods twice a day, then gradually working up to longer periods.
Alternate sitting meditation with walking meditation to train yourself to meditate under different circumstances.
You don't have to be a vegetarian, eat brown rice, or be anyone you aren't already to live Zen in your daily life.
You know you should exercise. Zen can help you cut through all the dread, pride, and other things you attach to exercise so you can "just do it".
Every day, indulge in microzazen moments and stop what you are doing, breathe, and pay attention to the present moment.