Can i stop and start doing martial arts (explanation) below?

Hi, thanks for looking at my ? I am a high school track and cross country runner and i cant do martial arts in the spring or fall, and i was wondering if (16 years old) i could start judo for the first time for a couple of months then stop for a couple of months then resume judo training at the same place i left off or is this not allowed?

Or does martial arts require you to make every practice or do you go to the ones you can make?
 
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