There are different types of yoga in the Gita

Many scientists and health practitioners recommend it for all sorts including stress. How is that futile?

https://www.bbc.co.uk/news/uk-england-wiltshire-67205331

https://www.bbc.co.uk/news/health-66807432

https://www.bbc.co.uk/news/health-49609597

https://news.sanfordhealth.org/cancer/survivorship-the-heali...

You may then want to question, if some ancient scripture spoke of this type of yoga and it has value, why not investigate the other types. It took the west decades before it started taking up Yoga (mostly because of christian resistance/influence). So why not research into the other types?