@JFG Sir, You are right, vacation is a vacation. But not in my case Forgive me as English is not my mother tongue so I might explain properly.
I do totally agree with you that we have to enjoy the vacation, leave charts at home, relax and live the moment, enjoy and etc. All are true, but my vacation differs as I go mainly to enhance my diving skills and achieve new diving certificate. So, mainly it is not a leisure trip, I have to study at night, attend courses and exercise the new skills, etc. That's why I try to be fit, care about my nutrition, as well as general health. As you can see training and exercising in the gym are part of my diving skills. I don't know how much you know about diving, but preparing myself for technical diving needs special fitness. Since two months I work on enhancing my cardio skills, running and sprinting are staple in my daily routine, also apnea exercises are a must to deal with certain situations underwater and of course are required for free diving.
Again, you are totally right about vacation, and eating seafood, and what locals eat. But they are not people on mission like my situation!!
Thanks sir and please forgive me if couldn't explain because of my language.