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Short answer: To lose weight, you need to eat fewer calories than your body burns in a day — usually 300–500 calories below your maintenance level. Maintenance is calculated in two steps: first your basal metabolic rate (BMR) using the Mifflin-St Jeor formula, then multiplying that by an activity factor. For a 154-lb (70 kg) person with moderate activity, a 500-calorie daily deficit produces roughly 0.8–1 lb of weight loss per week.

Short answer: You can launch a fitness marathon online in 2–4 weeks of preparation : choose a 7–21 day format, daily tasks (15–30 minutes), group chat for accountability, fixed start date, and pricing in the accessible impulse-buy tier. Marathons excel for first sales and testimonials before a full course.