Saudi Rehab Al Mahasnha works out at a local gym in Qatif, Saudi Arabia, April 21, 2018. Picture taken April 21, 2018. REUTERS/Hamad I Mohammed - RC1F2955CAD0

Image used for illustrative purpose. Fitness enthusiasts seen training in a gym. April 21, 2018.

Saudi Rehab Al Mahasnha (R) works out as Rana Al Shammaai assists her at a local gym in Qatif, Saudi Arabia, April 21, 2018. Picture taken April 21, 2018.

Saudi Reham Al Shaban (L) and Rehab Al Mahasnha (R) use stationary cycling machines during a warm-up before a morning training session in a local gym in Qatif, Saudi Arabia, April 21, 2018. Picture taken April 21, 2018. REUTERS/Hamad I Mohammed - RC13757AB890

Saudi Reham Al Shaban works out at a local gym in Qatif, Saudi Arabia, April 21, 2018. Picture taken April 21, 2018. REUTERS/Hamad I Mohammed - RC186B664B70

Saudi Rehab Al Mahasnha works out at a local gym in Qatif, Saudi Arabia, April 21, 2018. Picture taken April 21, 2018.

Saudi Rana Al Shammaai wears her scarf as she prepares to leave after her training at a local gym in Qatif, Saudi Arabia, April 21, 2018. Picture taken April 21, 2018.

Saudi woman pose for the camera at a gym in Qatif, Saudi Arabia April 21, 2018. Picture taken April 21, 2018. REUTERS/Hamad I Mohammed

Saudi Rehab Al Mahasnha works out at a local gym in Qatif, Saudi Arabia, April 21, 2018. Picture taken April 21, 2018.

Saudi Wadiha Al Dar (L) is seen on treadmill as she warms up with her colleagues before their morning training session in a local gym in Qatif, Saudi Arabia, April 21, 2018. Picture taken April 21, 2018. REUTERS/Hamad I Mohammed - RC180C066CC0. Photo used for illustrative purposes.

Saudi Wadiha Al Dar (L) assists Rehab Al Mahasnha (R) during their workout in a local gym in Qatif, Saudi Arabia, April 21, 2018. Picture taken April 21, 2018. REUTERS/Hamad I Mohammed - RC15960BD430

Saudi Wadiha Al Dar arrives for her training at a local gym in Qatif, Saudi Arabia April 21, 2018. Picture taken April 21, 2018.

Saudi Rana Al Shammaai (L) and Rehab Al Mahasnha (R) arrive for their training at a local gym in Qatif, Saudi Arabia, April 21, 2018. Picture taken April 21, 2018.

Saudi Wadiha Al Dar (R) assists Rehab Al Mahasnha (L) during their workout in a local gym in Qatif, Saudi Arabia, April 21, 2018. Picture taken April 21, 2018. REUTERS/Hamad I Mohammed - RC1C1ACC9860

Saudi Wadiha Al Dar (L) assists Rana Al Shammaai (R) during their workout in a local gym in Qatif, Saudi Arabia, April 21, 2018. Picture taken April 21, 2018. REUTERS/Hamad I Mohammed - RC11F95C0F30

Saudi woman pose for the camera at a gym in Qatif, Saudi Arabia April 21, 2018. Picture taken April 21, 2018.

Saudi Wadiha Al Dar works out in a local gym in Qatif, Saudi Arabia, April 21, 2018. Picture taken April 21, 2018.

Saudi Reham Al Shaban uses a stationary cycling machine during a warm-up before her morning training session in a local gym in Qatif, Saudi Arabia, April 21, 2018. Picture taken April 21, 2018. REUTERS/Hamad I Mohammed - RC185C3B0280

Saudi Rehab Al Mahasnha works out at a local gym in Qatif, Saudi Arabia, April 21, 2018. Picture taken April 21, 2018. REUTERS/Hamad I Mohammed - RC1819976D10

Saudi Wadiha Al Dar (R) and Rana Al Shammaai (L) work out in a local gym in Qatif, Saudi Arabia, April 21, 2018. Picture taken April 21, 2018.

Saudi Rehab Al Mahasnha works out at a local gym in Qatif, Saudi Arabia, April 21, 2018. Picture taken April 21, 2018.

Saudi Rehab Al Mahasnha works out at a local gym in Qatif, Saudi Arabia, April 21, 2018. Picture taken April 21, 2018. REUTERS/Hamad I Mohammed - RC1818290A00