Your children might not say it but they need to go out daily, and if you don't allow them, then probably you will regret it in future. Letting them outside daily for 1 hour is nothing harm on studies, routine and their daily life in fact it does add up to something nice. Every child needs to run and play to give his/her mind a relaxation and a sense of relief after tough schedule on School, and Studies.
You being a kid always loved playing outside, if you didn't they certainly it was an exceptional case. Allowing to go out is a positive sign which most of the parents take full use of. A break and a healthy activity can improve his/her overall performances in the studies, test, exams and other things, although television, cartoons and video games are something which should not be promoted in the daily routine while few hours in a week can do. Engaging them in outdoor is what going to make them, sharp, healthy and smart.
Interaction, making friends and playing with the heart out is something which can only be done when we are kids, making friends when grown up is not everyone's cup of tea. Your child needs to step out for a break either from, study or from sitting idle at home. If he/she is not fond of going out, than being a mentor and parent, it becomes your responsibility to share your knowledge and guide him/her through it.