Don't make a resolution you can't keep! It takes 30 days of working out to make it a habit and to start to see some results. Keep going for at least 30 days and you will develop the will and desire to continue.
Once you really start to see some positive changes in your body you will never want to stop.
I started at age 15 and still doing it with little time off for 50 years now!
Sure I take a break whenever I feel like it. Rest is necessary and time away for a week or two can be invigorating. But I always get back to the weights. At 66 I can still say it is well worth the effort.
Go for it!!
Here I am at age 63.... no body builder. just staying in shape
Photo taken at the Dead Sea