What can I say, it was a great idea :D
There are still a couple of more things I want to add to the gym.
Such as making it look better and more decorated when upgrading. As well as some animation variations for the different tasks. but that wont be for a while now.
gotta say, i really like how the last three updates have changed the game together.
an idea for a future improvement: while i do enjoy the way training is actually interactive now, an "auto-gym" option would probably be a good idea. both as a toggle for those who want to skip the "tedium" of the minigames, and as some kind of improvement in the game.
the way i see it, the toggle could give you slightly below average returns, and the upgrade would give average gains. this way it'd still be an advantage for toggle users to buy the upgrade.