Born in Kafr El Sheikh, Elssbiay started to train professionally as a bodybuilder in 2009 after moving to Kuwait.

After several years of representing multiple supplement companies, he started his own brand, Red Rex, in 2022, and has worked as a show promoter.

[6] Mamdouh Mohammed Hassan Elssbiay was born on 16 September 1984 in Al-Sebea, a town in Kafr El Sheikh, Egypt.

[8] Elssbiay earned his pro card by winning the overall title at the 2012 Amateur Olympia in Kuwait City.

[11] In October 2020, Elssbiay tested positive for COVID-19, preventing him from participating in the 2020 Europa Pro Bodybuilding Championships.