This is alright, though I do think it's approaching on "too similar" to JTK Night Sakura. I understand that nobody owns colors, but this looks pretty darn similar.
I have to +1 the comment on the novelties not really being appealing for me, I admit I'm not a fitness person but I feel like this is just a sort of strange clash of interests or something, not sure.
I would also like to note:
Mod Legends : GMK Stock Cold White
Alphas Legends/Accents : Custom RAL - A shade of baby pink.
Alphas : Custom RAL - A lighter shade of blue grey
Modifiers/alt alphas : Custom RAL - A shade of dark blue grey
This... doesn't really mean anything? I wanted to check the colors on my books to see if they were actually too close to Night Sakura or other similarly designed sets, but I can't because you haven't listed any actual colors, not even the GMK stock color.
Please update these when you figure out your color matching, it's a very important part of the process and crucial for people to know if they will like what they see. Please please please tell us the colors you end up choosing.