I use them to run distances and this is amazing running leggings. The first time I wore them I could felt nicely compressive, supportive and warm. They did leave my legs feeling less tired and alleviate the uncomfort at my knee. For sure they could help me run further and make my legs more durable. Definitely recommend for runners and well worth the investment for anyone covering distance.
I was struggling between M & L and finally I chose to buy M (my height 176cm, weight 66kg and waist 84cm). I believe it is a right choice offering the best function. Though it is a bit difficult to wear (but it is tights and is supposed to be so), they work pretty well!