Ken Waller shares his secrets to his muscular mass.Source: Muscle Builder Power (May 1975) Page #52 - Muscle Builder Power (May 1975) Page #53 - Muscle Builder Power (May 1975) Page #54 - Muscle Builder Power (May 1975) Page #55 - Muscle Builder Power (May 1975) Page #78 - Muscle Builder Power (May 1975) Page #79 - Muscle Builder Power (May 1975) Page #81 - Muscle Builder Power (May 1975)