It's very likely the case that you have tight hamstrings from sitting in chairs a lot. I do, and so do most people who work at desks or use computers for long periods of time.
There are lots of ways to go about improving matters, but none of them are quick or painless. The thing to keep in mind is that muscles do no "stretch." That is a misnomer. The just tense and release. When you release the tension in a muscle, it elongates.
Some things that can help loosen the hamstrings: stretch the calves first, massage the bottoms of your feet with a tennis ball, do some very light leg swings to the front and back (at a low speed and height) until you feel some release.
There are a lot of things you can try. Do you have a yoga teacher who can help you work on this, or are you practicing alone?
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