How can I do life activities like exercising and studying and not feel like I am wasting time because I should be reading the Koran, praying and reading Tasfir for the sake of Allah? How do I manage this feeling?
The meaning of worshiping Allah (SWT) is not limited to reading Quran or Tafseer or praying Salah but it is much wider up to the extend of including all useful life activities including studying, working, eating, exercising, resting etc as far as the activity is done for noble cause e.g. being healthy to do good.
There is a Prophetic Hadeeth advising to keep every act of life, for the sake of Allah. That will make life a continuous worship.
Wassalam.