This asana is low lunge variation (a heart-opener and side body stretch) that I built into my home flows sometime last year. It's a sort of hybrid of Exalted (aka Reverse) Warrior and Low Lunge, and I find it gives me a little boost of energy (or confidence, perhaps?), as long as I'm properly warmed up and my body is open to it -- sometimes it just feels too deep, like I'll be compressing my low spine to reach my heel and achieve the depth (don't do that).
You can modify this pose by placing a yoga block on the outside of your back foot or calf muscle. Or alternatively, you can hold onto your calf, closer to your knee, as long as that feels stable and supportive: make sure you're not collapsing your weight down.
As always, practice at your own pace and don't push yourself through pain or excessive discomfort. Breathe deeply and stay connected to your body, modifying your practice as needed. I hope you find these tips useful!