To go Gym whilst Fasting
In the name of Allah, the most Beneficent, the most Merciful.
Answer
To go gym whilst fasting or to engage yourself in physical activities would not break your fast. However, if you fear that by going to the gym it will make you weak then it will be makruh for you to go there. (Masaail Roza p.188, Mufti Rafat Qasimi)
Only Allah Knows Best
Mohammed Tosir Miah
Darul Ifta Birmingham