The tip says: Wash your face with MILD soap-free formula twice a day AND WHENEVER IT'S EXPOSED TO ENVIRONMENTAL DIRT.
Exercise causes a lot of oil & sweat to come out of your skin which helps clog the pores & that agravates acne eruption.
Another issue is if you are doing your workout outdoors there's alot of environmental pollution & dirt that stick to your sweaty face & worsen the condition.
One more thing is if you do this in a gym, it's well-known that gyms are contaminated with germs that aggravate the acne & cause them to get infected.
My advice to you is to use a gentle foaming or gel cleanser day, night, & after working out. You can use a light-weight moisturizer once daily to avoid dehydrating your skin. Dont forget as well to remove your make up before going to bed, in this i prefere to use milk make-up remover followed by gel wash-off cleanser. As a moisturizer you can use extra virgin olive oil that nourishes & rehydrates your skin, use it at night after cleansing your face when going to bed.