Quickest way to drive traffic is either Google Adwords (SEM) or Facebook Ads, however, with a limited budget you can't guarantee sales (you will be paying per click). This is also a great place to test different copy, images, or audiences to see what works best for your website.

A great way to spend marketing budget when you are first getting started and on a limited budget is affiliate marketing. Basically you pay a commission to other sites that drive sales for you (pay per sale model) or when someone submits a lead form (pay per lead model). This is not the fastest way as you need to structure your program and find affiliates, but you typically don't start spending your budget until sales are coming in. Niche markets are usually a good fit for this so your yoga should align nicely.

Shareasale is the largest when you are just getting started but this article has an aanalysis of some other options as well.
https://growtraffic.com/blog/2016/09/affiliate-alternatives-shareasale