I don't, thank you. With that out of the way, how high does this stat have to be for this option to appear?
I'm not sure. For future reference, a LOT of the game is dependent on those two stats so make them a priority on your next play-through. If you haven't read it yet, toolkitxx has a great general guide to this game here -->
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Personally, when starting a new play-through, I'll distribute fliers, check the park for money, and workout everyday until I level up once (opens the construction labor job). I then work the construction job and do fight training every day (the labor job increases your fitness stat). Unfortunately, you won't have any energy left after this routine to explore, but you can work on Mom and Sister during this time. Once fighting is maxed, you can then workout to max out the fitness. You usually can max them out before school starts. Good luck!