I am a college student and regularly run ~2k (5 rounds of standard athletic track) everyday (Although, regularity gets broken around the time of examinations or submissions for as long as a month). So, whenever I try to restart the streak of running, my body tends to become stiff and probably due to improper warmup, after first day running, I usually face unbearable body aches. This makes doing routine jobs too painstaking for me. This phenomena is usually sorted after a week or so; after which it becomes okay to run without much of an issue.
So, are there any recommendations over some warmup excercises and/or dietary plan which I must follow to prevent such pain?