Bro to keep your health good you have to eat healthy food first.

Keep exercise daily and start lifting light weight things.

As the time passes you become more strong and day you feel more confident about your health.

Always push yourself to do something extra then previous day.

Take five time meal with limited quantity and drink 2 Litter water daily.

You can join GYM also but i don't think every human need GYM. You can maintain your physic only by doing good exercise daily.

Must give 1 Hour daily for exercise and even do yoga

You will feel change after 3 months i promise.

Good Luck @exyle