Asked by MICAH LAME
what is the FIT formula for developing cardiorespiratory endurance
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Answered by
GPT-5 mini
AI
You probably mean the FIT (or FITT) formula used to plan cardio training: Frequency, Intensity, Time (and Type). For developing cardiorespiratory endurance use these guidelines:
- Frequency
- 3–6 sessions per week.
- Beginners: 3 days/wk; most people progress to 4–5; athletes may train 5–6.
- Intensity
- Use heart rate, %VO2/heart-rate reserve (HRR), or perceived exertion.
- Moderate: ~40–59% HRR (≈64–76% HRmax) — comfortable but brisk.
- Vigorous: ~60–89% HRR (≈77–95% HRmax) — noticeably hard.
- RPE: moderate ≈ 12–13 (Borg 6–20) or 4–6/10; vigorous ≈ 14–17 (Borg) or 7–9/10.
- Tip: beginners start at moderate, progress toward more vigorous work or include intervals.
- Time (duration)
- 20–60 minutes per session (continuous or accumulated).
- Aim for 150 min/wk moderate or 75 min/wk vigorous (minimum). Greater improvements often require 150–300 min/wk moderate (or equivalent).
- Type
- Rhythmic, continuous activities using large muscle groups: walking/brisk walking, running, cycling, swimming, rowing, cross-country skiing, aerobic classes.
- Include interval training or hill work to boost improvements once base fitness is established.
Progression and practical tips
- Increase one variable at a time (e.g., duration by ~5–10% per week, then frequency, then intensity).
- Warm up 5–10 min and cool down after each session.
- Monitor with HR (target zones) or RPE; use the Karvonen method for more accurate targets: Target HR = Resting HR + %*(HRmax − Resting HR).
- Get medical clearance if you have risk factors or health issues.
Quick example
- 30-year-old, HRmax ≈ 190 bpm. Moderate zone ≈ 64–76% HRmax → ~122–144 bpm. A beginner could do 3 × 30 min brisk walks at ~125 bpm/walking pace, progressing to 4–5 sessions or longer durations.
If you want, tell me your age, resting HR and current activity level and I’ll give a specific FIT(T) plan.
- Frequency
- 3–6 sessions per week.
- Beginners: 3 days/wk; most people progress to 4–5; athletes may train 5–6.
- Intensity
- Use heart rate, %VO2/heart-rate reserve (HRR), or perceived exertion.
- Moderate: ~40–59% HRR (≈64–76% HRmax) — comfortable but brisk.
- Vigorous: ~60–89% HRR (≈77–95% HRmax) — noticeably hard.
- RPE: moderate ≈ 12–13 (Borg 6–20) or 4–6/10; vigorous ≈ 14–17 (Borg) or 7–9/10.
- Tip: beginners start at moderate, progress toward more vigorous work or include intervals.
- Time (duration)
- 20–60 minutes per session (continuous or accumulated).
- Aim for 150 min/wk moderate or 75 min/wk vigorous (minimum). Greater improvements often require 150–300 min/wk moderate (or equivalent).
- Type
- Rhythmic, continuous activities using large muscle groups: walking/brisk walking, running, cycling, swimming, rowing, cross-country skiing, aerobic classes.
- Include interval training or hill work to boost improvements once base fitness is established.
Progression and practical tips
- Increase one variable at a time (e.g., duration by ~5–10% per week, then frequency, then intensity).
- Warm up 5–10 min and cool down after each session.
- Monitor with HR (target zones) or RPE; use the Karvonen method for more accurate targets: Target HR = Resting HR + %*(HRmax − Resting HR).
- Get medical clearance if you have risk factors or health issues.
Quick example
- 30-year-old, HRmax ≈ 190 bpm. Moderate zone ≈ 64–76% HRmax → ~122–144 bpm. A beginner could do 3 × 30 min brisk walks at ~125 bpm/walking pace, progressing to 4–5 sessions or longer durations.
If you want, tell me your age, resting HR and current activity level and I’ll give a specific FIT(T) plan.
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