Dave Durell has been in the fitness field for most of his life. Starting out as a physical therapist assistant, he moved on strength coaching in collegiate football and NFL teams and he has owned and operated the Rock Solid Fitness personal training studio for over 40 years. His goal is to help people - especially those over 50 years of age - to get fit and stay strong throughout their remaining years.
His website, https://strengthafter50.com, is very popular and contains a multitude of training programs and blog posts with information to help users get stronger and enjoy active retirements.
His free report New Rules for Strength Training After 50 is available on his website, along with 4 free workout videos.