About a month ago, I went for a long-distance run. For 3 days after the run, I felt muscle soreness and tension, and pain in the lower back and groin. My good friend told me about the HyperBlade, so I decided to buy one. Yesterday I went for even longer distance run than last month. I used HyperBlade in combination with myofascial release during warmup before the run and also during cool-down after the run. And today, I'm totally pain-free! Looks like this tool is a huge game-changer in training recovery. Thank you HyperBlade!