Avoid gym weight training, do proper assessment & do free  mobilization exercises for spine

Hello sir, Firstly as u have AS then u have to do exercises regularly u should not leave the exercises U should do basic streching exercises it will help u to maintain flexibility U can do strengthning exercises but don't lift too weight. As your flexibility increses your muscles will work properly and this will also help to reduce some weight.

visit physiotherapy clinic for proper assessment then only proper exercises can be suggested.

Hello sir, please do consult a physiotherapist in person, they will examine and suggest a right treatment plan. As you didn't mentioned your stage of AS, your details.

Yoga asanas with proper guidance will help you to be flexible and fit.

Visit nearby physiotherapy clinic for proper assessment and treatment sir.with out assessment can't suggest u treatment plan.