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No, a 40-day fast is unsafe for most people; a water-only plan demands medical supervision and strict monitoring.

Speeds are close; set ~1% incline to mimic outdoor air drag, and expect wind and terrain outside to shave seconds off your pace.

Yes, you can run while fasting if you manage timing, pace, and hydration with care.

Yes, mouth rinsing during a fast is fine if nothing is swallowed; some religious fasts place limits.

Yes—smoking cannabis during a fast doesn’t add calories, but cravings and safety concerns can derail fasting goals.

Yes—water is fine during most health or time-restricted fasts; skip water only during dry or daylight religious fasts, and follow any medical rules.

Yes, you can use non-swallowed breath fresheners while fasting, but sweet gums or anything swallowed can break a religious or strict fast.

Yes, mouth spray can fit some fasts; for religious fasting it’s allowed only if nothing reaches the throat.

Yes—if ketosis is the goal; on a strict zero-calorie fast, MCT oil ends the intermittent fast.