Is Yoga a sin
The answer is no, although it does have religious overtones.
Yoga is about connecting with yourself, others, and the cosmos.
Many yoga practitioners believe in a universal energy or awareness that connects all things.
The ultimate purpose of yoga is to integrate one's unique consciousness with universal awareness
All religion can follow yoga there is no restriction to keep your body fit and healthy as per hinduism
There is no harm in performing yoga for the sole purpose of exercising.
Many Christians prefer to achieve this by joining a yoga session at their area gym or fitness centre instead of going to an ashram (Hindu temple).
Don't practise yoga if it contradicts your religious beliefs.
Stay happy and healthy and keep practicing yoga