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Define "as good a shape as possible" perhaps?
Your body remembers, so if you revert to previous food + training states, it'll go back strength/muscle wise reasonable quickly, looks wise that depends if it's 1 or 10 years between... ;)
And "let go of perfection/plan". That sounds kack, but a sneaky 20 minutes kettlebells/looking like a derp in the park is way better than "shit can't train at all, cos need to go to gym etc..."
So, if you've half an hour grabbing some kettlebells at home means you can do your HIIT style there and do some strength/core. I do that on driving days where I don't go to gym either (miss my bike :/
As for diet, myfitnesspal, track, do it. If you've no clue of calories/protein it's all guesswork.
So tl;dr
1 - Your Goal (what you want + what you can do, see a six pack for me is misery, so I do not want, even though I can)
2 - Track your time, find some slots you can sneak in some exercise (gets bells and pullup rack if you must, maybe at work you can do a wee run in breaks)
3- Track your food. Make it sustainable, 2 months of just lean protein and veg may mean a grumpy wedding...
I like weighted decline crunches. Hold a plate out from your chest and then do 4 sets of 25. It's super quick and if you go quick enough it's also a little touch of cardio.
I've had one of those periods where everything gets in the way of the gym - a week of being super busy clearing up at work (think office till 10/11pm) then on holiday skiing, and drinking and eating accordingly (specifically a significant amount of beer, nutella, pizza, chips et fromage) and then back into a fortnight of having a shitload of stuff on, plus being busy at work again. It is so, so frustrating as I have set a goal of June to get myself in as good a shape as possible before my stag do in june (as my wedding is 2 weeks later).
Any tips? Planning to make my diet as strict as possible and incorporate as much HIIT as possible. Problem is, I get so bored with cardio.