The meditation center where i teach is sponsoring a May Meditation Challenge and sending out daily inspirational messages. (You can sign up here.)
For those who have a sporadic practice, the goal is to sit every day.
For those who have an established practice, perhaps you could sit twice a day.
For myself, i've taken on the challenge of sitting outdoors every day.
I do love sitting on my deck and listening to the fullness of birds singing all around me. This morning, a gray squirrel sat 2 feet away from me. I watched her breathing, and she watched me breathing.
I can hardly wait to go meditate on my deck again :)