In the initial screening talk with your coach, you will cover what limitations you may have with injuries/illnesses etc. From here if you do have significant health-related issues you will be referred to get more professional guidance before continuing on.
However, if you have had previous injuries/illnesses and do not suffer from them anymore or have slight issues with the problem area in question, the coaches here at Hammer Athletic are skilled enough to avoid, strength where necessary and regress if needed to accommodate all sorts of injuries and illnesses. To do nothing is not a cure (well usually).