I use an adjustable leash.
I have a bad wrist on my left arm , and with all my other old age orthopedic issues this comes in handy as I can put it over my should, or around my waist, I can lengthen it or shorten it. By putting it over my shoulder it is shorter and I can hold the leash and have my body as backup should he suddenly lunge.

Amazon.com : Brown 6 Way European Multifunctional Leather Dog Leash, Adjustable Schutzhund Lead 49"-94" Long, 3/4" Wide (18 mm) Large : Pet Leashes : Pet Supplies
Amazon.com : Brown 6 Way European Multifunctional Leather Dog Leash, Adjustable Schutzhund Lead 49"-94" Long, 3/4" Wide (18 mm) Large : Pet Leashes : Pet Supplies
www.amazon.com
I have a bad wrist on my left arm , and with all my other old age orthopedic issues this comes in handy as I can put it over my should, or around my waist, I can lengthen it or shorten it. By putting it over my shoulder it is shorter and I can hold the leash and have my body as backup should he suddenly lunge.