So, im 17, 5' 7", 135 lbs. And i used to be in good shape and had decent stamina but i haven't been in athletic practice for about 3 years now (change of school and other reasons). My schedule is verry odd and dont have time to visit the gym or such, and i dont have weights or any equipment at home. At the moment i have started doing about 15 sit ups and push ups every day or every other day but thats it. i have no idea about fitness at all. im not a fitness freak or obsessed to get visible muscles all over but i want to be in a bit bit above average shape. my main sport is cricket and i just finished my first season in a team which spiked my concern so any tips or any cricket specific fitness tips would be appreciated. thanks