Diving is an activity with a high level of physical & mental stress. Sport (recreational) is stressful, technical diving is even more! That’s why we need to be in an appropriate status all the time in order to enjoy diving in a safe manner, return to our family and friends and plan further adventurous activities and explorations trips.
Signing the 2020 medical screening self-declaration form is a good practice but does not really protect you as a diver but the professional (Dive Center, Instructor, or Divemaster).
Depending on the country and local legislation, the validity of your medical form can be of 1 or 2 years. Anyway, keep in mind that, as with any medical check, your medical fitness level is certified as “good” at that present moment and it may alternate in the future. Therefore, is your responsibility to stay up to date physically & mentally by regularly practicing exercises and following an adequate diet.
As I always say, SCUBA diving insurance is highly recommended but does not make miracles, and maintaining a good fitness level IS in your hands only. Knowing first response procedures is very useful but again, a good fitness level will be always a bonus for the provider (and especially, from Rescue Diver level up).
Consult with your physician and keep him updated with your medical status in order to get best medical advises and treatments.
Maintaining a good physical & mental level is at the end, a moral obligation. Is for you (and your family and friends) and is for your diving team or dive buddy. If you are in troubles in-water/underwater due to your poor medical fitness, you will affect the entire dive team and even the entire dive operation.
Performing a medical check (diving and non-diving related) is not just for the signed paper. Being proactive, you may discover in advance some hidden or not-yet developed medical issues and you may have good time in advance to correct and even improve the situation!
Diving is fun but is in our hands to make it, and fitness level is one of the cards from the overall puzzle (ANDI’s ATKEE principles).