Honestly, I find it to be miserable at first too, which really sucks. I've stopped and started exercising multiple times in my life and it's always difficult for me to get back into for this reason. However, I've found that if I comfortably push through I get to a point where I'm struggling less and it becomes more satisfying. That's when I start enjoying it because I can start setting specific goals and working towards them.

The secret to it is to learn which kind of misery to keep pushing through and which kind of misery is an emergency stop. You gotta get comfortable with being uncomfortable. Then... It kind of becomes more comfortable.