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by JenrHywy 2392 days ago
I'd say that I'm in a similar position to you, though not as fit. I do a short HIIT session every day and am marginally chubby.

What's your non-fasting diet like? Fasting is the quickest way to get into ketosis. If you're used to eating a carb-heavy diet, the switch into ketosis can be brutal. So if you either ease off carbs leading up to the fast, or just all the time, it'll be easier.

The other thing is electrolytes. Your body doesn't store them, so you (IMO) have to supplement. If you start to feel like crap, have 1tsp of salt in about 1L of water and see if it fixes it. I also supplement with magnesium and occasionally potassium.