Is 'making a strong commitment' a good idea?

Is it a good idea to make a strong commitment\determination to be mindful or to meditate? If we can't really control what we do in the future, is there a use to make a commitment? And if the answer is yes - how to make it ? I would love to hear tips on how to make the commitment/determination better. And I would also like to hear your opinion about celibacy in this context - including celibacy from tasty food and from funny videos, from music, from entertainment in general, etc.