Asked by Why
I am 15, and I weigh around 165 pounds. I am 5'2, and I lose 100 calories 1 or 2 times a week. I want to lose 32 pounds in 4 months. How many times a week do I need to run on the treadmill to achieve this goal? Also, what abs workout can I do to achieve this weight goal as well?
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Answered by
GPT-5 mini
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Thanks — good that you’re thinking about this, and also good to ask before making big changes. A few important points up front:
- At 15 years old you’re still growing, so you should avoid very large calorie deficits or very rapid weight loss. Talk with a parent and your doctor (or a registered dietitian) before starting any aggressive plan.
- Spot reduction doesn’t work: doing ab exercises will strengthen and tone your core but won’t specifically melt belly fat. Overall calorie balance + full‑body exercise is what reduces body fat.
- Losing 32 lb in 4 months (about 16 weeks) is an aggressive target. Here’s the reason and a safer alternative.
Quick math (so you see where the numbers come from)
- One pound of body fat ≈ 3,500 kcal. Losing 32 lb ≈ 112,000 kcal total.
- Over 16 weeks that’s about 7,000 kcal/week or ~1,000 kcal/day of net deficit.
- A 1,000 kcal/day deficit is large and not recommended for most teens — it risks nutrient shortfall and interfering with growth and athletic performance.
A safer, realistic goal for someone your age
- Aim for about 0.5–1 lb per week (for teens, many clinicians recommend staying toward the lower end). Over 16 weeks that’s 8–16 lb. That’s much safer and still a meaningful change.
How exercise (treadmill running) fits in
- Running helps create a calorie deficit, but you’ll also need dietary changes for sustained loss. Example calorie burns for a 165 lb (≈75 kg) person:
- 1 mile ≈ 100–110 kcal (rule of thumb).
- 30 minutes jogging (moderate pace) ≈ 300–450 kcal depending on speed.
- 45 minutes of steady faster running ≈ 450–600+ kcal.
- Practical recommendation: 150–300 minutes of moderate aerobic activity per week (this is the general adult guideline; for improving weight and fitness you can aim toward the higher end if you feel good). That translates to:
- 30–60 minutes on the treadmill, 4–6 times per week, mixing steady runs and interval sessions.
- Example weekly treadmill plan: 3 steady runs of 30–45 min + 1–2 interval (HIIT) sessions of 20–25 min + 1 longer easy run (45–60 min) = good mix.
- If you burn ~400–600 kcal per run and run 4–5 times per week, that’s ~1,600–3,000 kcal/week from running. Combine that with modest daily dietary changes (for example a 250–500 kcal/day reduction), and you can reach a safe weekly deficit that leads to ~0.5–1 lb/week.
Abs/core work (do these 2–3 times per week)
- Frequency: 2–3 times/week (nonconsecutive days). Keep sessions 10–20 minutes as part of a full workout.
- Example core circuit (3 rounds):
1. Plank — 30–60 seconds
2. Side plank — 20–40 seconds per side
3. Bicycle crunches — 20 reps (10 each side)
4. Hanging or lying leg raises — 10–15 reps
5. Russian twists — 20 reps (use light weight or bodyweight)
6. Dead bugs — 12–16 reps
- Rest 45–60 seconds between rounds.
- Add progressive challenge over weeks (longer planks, more reps, small weights for Russian twists, slow controlled tempo).
- Don’t skip full‑body strength training — 2 sessions/week of squats, lunges, push‑ups, rows, and deadlifts (light to moderate weight under supervision) will increase muscle, raise your metabolism, and improve body composition.
Food and recovery (critical for teens)
- Focus on whole foods: vegetables, fruit, lean protein (chicken, fish, eggs, legumes), whole grains, dairy or alternatives, healthy fats.
- Avoid extreme calorie cutting. Try a modest reduction (for many teens, that might mean cutting sugary drinks/snacks and watching portions) rather than “starving.”
- Eat enough protein to support growth and workouts (a rough starting point is 0.6–1.0 g/kg body weight, but a dietitian can give personalized numbers).
- Sleep (8–10 hours), hydration, and stress management strongly affect weight and fitness progress.
Safety and medical advice
- Because you’re 15, please consult a parent/guardian and your primary care doctor before starting a new weight-loss program. They can check growth, health status, and advise what’s safe for you.
- If you want, ask for a referral to a registered dietitian who specializes in adolescents.
If you’d like, I can:
- Build a sample weekly treadmill + strength + core plan for your current fitness level, or
- Help sketch a realistic calorie/food plan that’s teen-appropriate.
Which would you prefer?
- At 15 years old you’re still growing, so you should avoid very large calorie deficits or very rapid weight loss. Talk with a parent and your doctor (or a registered dietitian) before starting any aggressive plan.
- Spot reduction doesn’t work: doing ab exercises will strengthen and tone your core but won’t specifically melt belly fat. Overall calorie balance + full‑body exercise is what reduces body fat.
- Losing 32 lb in 4 months (about 16 weeks) is an aggressive target. Here’s the reason and a safer alternative.
Quick math (so you see where the numbers come from)
- One pound of body fat ≈ 3,500 kcal. Losing 32 lb ≈ 112,000 kcal total.
- Over 16 weeks that’s about 7,000 kcal/week or ~1,000 kcal/day of net deficit.
- A 1,000 kcal/day deficit is large and not recommended for most teens — it risks nutrient shortfall and interfering with growth and athletic performance.
A safer, realistic goal for someone your age
- Aim for about 0.5–1 lb per week (for teens, many clinicians recommend staying toward the lower end). Over 16 weeks that’s 8–16 lb. That’s much safer and still a meaningful change.
How exercise (treadmill running) fits in
- Running helps create a calorie deficit, but you’ll also need dietary changes for sustained loss. Example calorie burns for a 165 lb (≈75 kg) person:
- 1 mile ≈ 100–110 kcal (rule of thumb).
- 30 minutes jogging (moderate pace) ≈ 300–450 kcal depending on speed.
- 45 minutes of steady faster running ≈ 450–600+ kcal.
- Practical recommendation: 150–300 minutes of moderate aerobic activity per week (this is the general adult guideline; for improving weight and fitness you can aim toward the higher end if you feel good). That translates to:
- 30–60 minutes on the treadmill, 4–6 times per week, mixing steady runs and interval sessions.
- Example weekly treadmill plan: 3 steady runs of 30–45 min + 1–2 interval (HIIT) sessions of 20–25 min + 1 longer easy run (45–60 min) = good mix.
- If you burn ~400–600 kcal per run and run 4–5 times per week, that’s ~1,600–3,000 kcal/week from running. Combine that with modest daily dietary changes (for example a 250–500 kcal/day reduction), and you can reach a safe weekly deficit that leads to ~0.5–1 lb/week.
Abs/core work (do these 2–3 times per week)
- Frequency: 2–3 times/week (nonconsecutive days). Keep sessions 10–20 minutes as part of a full workout.
- Example core circuit (3 rounds):
1. Plank — 30–60 seconds
2. Side plank — 20–40 seconds per side
3. Bicycle crunches — 20 reps (10 each side)
4. Hanging or lying leg raises — 10–15 reps
5. Russian twists — 20 reps (use light weight or bodyweight)
6. Dead bugs — 12–16 reps
- Rest 45–60 seconds between rounds.
- Add progressive challenge over weeks (longer planks, more reps, small weights for Russian twists, slow controlled tempo).
- Don’t skip full‑body strength training — 2 sessions/week of squats, lunges, push‑ups, rows, and deadlifts (light to moderate weight under supervision) will increase muscle, raise your metabolism, and improve body composition.
Food and recovery (critical for teens)
- Focus on whole foods: vegetables, fruit, lean protein (chicken, fish, eggs, legumes), whole grains, dairy or alternatives, healthy fats.
- Avoid extreme calorie cutting. Try a modest reduction (for many teens, that might mean cutting sugary drinks/snacks and watching portions) rather than “starving.”
- Eat enough protein to support growth and workouts (a rough starting point is 0.6–1.0 g/kg body weight, but a dietitian can give personalized numbers).
- Sleep (8–10 hours), hydration, and stress management strongly affect weight and fitness progress.
Safety and medical advice
- Because you’re 15, please consult a parent/guardian and your primary care doctor before starting a new weight-loss program. They can check growth, health status, and advise what’s safe for you.
- If you want, ask for a referral to a registered dietitian who specializes in adolescents.
If you’d like, I can:
- Build a sample weekly treadmill + strength + core plan for your current fitness level, or
- Help sketch a realistic calorie/food plan that’s teen-appropriate.
Which would you prefer?
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