For many of us, working out is a core part of our identity. It's taken literal years to get to the levels we're at, and to see that progress roll backwards is debilitating, in a mental sense.

Since you don't work out, I assume you like food. Imagine if you had to spend months eating nothing but Soylent because of $reasons, then when you complain you get chirping like "I don't get it, it's the same nutritional value, you don't need any real food".