I’m a pet sitter and I walk up to 10 miles a day with dogs. Even if pups don’t PULL pull (iykyk), the constant extension of one are and slight twisting of my body has had a big effect on my back over time. Using this leash has allowed me to enjoy walks without pain and discomfort and for that I’m so appreciative.
In regards to sizing, I have both, so here are my thoughts! I am 5’ tall and use the shorter leash most of the time. It keeps dogs pretty close to my side and the traffic handle is within easy reach. I use the longer leash on hikes when I want dogs to have freedom to sniff and explore without being off leash and it’s perfect. My partner also uses the longer leash and at 6’ tall it’s a great length on the same way the shorter one works for my height.