Laziness happens due to the tiredness in the body and mind, like lack of confidence, the appearance of the body due to the comparison, complexion matters, lack of speech among friends or in the group of persons.
When a person tries to do a work, again and again, the work not gets finished then the body get tired first in case of the physical work, mind get laziness after the body.
If the work is mental work like studying, calculating sums, solving problems for the exams again and again and not able to understand the sentences mentioned also will bring tiredness in the mind first and then the body also becomes tired with hatred. This will sometimes lead to the procrastinating due to lack of self-confidence, not finishing up the work on time, not eating and drinking properly, eating too much when there is a failure.
To be active first understand what the problem is, try to coordinate with some members of the family if it's a family problem, get the help of the friends also. This is one of the ways to solve the problems and get refreshed. This will not allow your mind to be tired or to procrastinate things around you.
Wake up early in the morning and do some sort of physical exercise for mind and body.
Jumping jacks, skipping, jogging, walking, running, lifting heavy items makes the body sweat and gives some activeness to the body. Meditation gives strength to the mind that gives confidence. Even a meditation for about 10 minutes refreshes the mind and brings a kind of freshness to the mind and body.
Drinking lots of water makes you fresh during the summer, drinking juices like pomegranate, lime juice, watermelon juice, carrot juice, adding green vegetables to your diet will give strength and activeness in the body.
Read books in small paragraphs and then convert them into big paragraph gives you the reading habit. Problem-solving skills comes after lots of understanding the problem, trying to break the problems into pieces and applying the solution will get a solution for the major problems.