Gyms need to be changed to essential business.  People's mental health and physical health are built around fighting diseases.  This starts with keeping physical fitness at the forefront during the covid-19 quarantine   With people being isolated mental health can become affected along with physical health which can increase them from becoming healthy to sick.  

Below includes some of the proposed guidelines:

Making spacing limitations and making enough room for everyone.
Making sure shared equipment, machines, weights and other workout devices should be minimized to the greatest extent possible.
Sanitizing and disinfecting, each gym would need to follow strict practices.
Members and trainers will be required to stay at home if they show any signs or symptoms of COVID-19.