Anyone Selling cycle?

I'm looking to buy a new cycle for fitness purposes. The standard ones for adults are too big for me and the ones made for kids are too small :(

Not sure what to do. Any advice?

Can someone suggest where I can buy a decent bicycle as I wanted to focus more on cardio. I am looking for a shop that can offer buy back option in case I am forced to sell the cycle due to various factors (relocation, further studies etc).

I have shifted recently to Blr and for commuting I need a second hand bike as of now. From where I can get it at a good price and in good condition. Any ideas? You can DM me also