Interval Timer

A timer that alternates between work and rest periods. Perfect for HIIT (High-Intensity Interval Training), Tabata, stretching, and various workouts. Set your work and rest times, and the timer will automatically repeat with sound alerts for phase transitions.

Work Time (sec)

Rest Time (sec)

Rounds (times)

Ready

00:30

0 / 8 rounds

※ Suitable for HIIT, Tabata, stretching, etc.
※ Sound alert before each work phase
※ Keep browser tab open

RATGEBER

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What is Interval Training? Scientific Benefits of HIIT

Interval training alternates high-intensity exercise with rest periods, burning more calories in less time than steady-state cardio. HIIT (High-Intensity Interval Training) involves 20-40 seconds of intense exercise followed by 10-60 seconds of rest, recognized by ACSM as one of the most efficient exercise methods. Scientific benefits: VO2 max increases 8-15% (twice as fast as traditional cardio), EPOC effect (continuous calorie burn for 24-72 hours post-workout), body fat reduction while preserving muscle, 23% insulin sensitivity improvement (in just 2 weeks), 5-8mmHg blood pressure reduction. 30 minutes of HIIT equals 60 minutes of traditional cardio in effectiveness.

HIIT vs LISS - Which is Right for You?

Understanding the difference between HIIT (High-Intensity Interval Training) and LISS (Low-Intensity Steady State) helps create an effective exercise plan. HIIT pros: Short duration (20-30 min), high calorie burn (400-600kcal per 30 min), elevated metabolism for 72 hours post-workout, muscle preservation. HIIT cons: Higher injury risk, requires recovery time (48 hours), challenging for beginners. LISS pros: Lower injury risk, can be done daily, suitable for recovery, beginner-friendly. LISS cons: Longer duration needed (60+ min), lower calorie burn (300kcal), possible muscle loss. Optimal combination: 2-3 HIIT sessions + 2 LISS sessions weekly for a balanced routine.

The Tabata Protocol: 4-Minute Miracle

Developed by Japanese scientist Dr. Izumi Tabata, this is ultra-high-intensity interval training. Tabata structure: 20 seconds work (170% max heart rate) + 10 seconds rest × 8 rounds = 4 minutes total. Research results: 4 sessions weekly for 6 weeks improved aerobic capacity by 14% and anaerobic capacity by 28%. 4 minutes of Tabata equals 60 minutes of traditional cardio. Creates 'afterburn effect' with elevated metabolism for up to 72 hours. Best Tabata exercises: Burpees (full-body, highest calorie burn), squat jumps (lower body power), mountain climbers (core strengthening), jump rope (cardio). Beginner caution: Don't start with Tabata immediately—adapt with general HIIT for 4-6 weeks first.

Work/Rest Ratio Science - Optimal Combinations by Level

Interval training effectiveness varies greatly based on work/rest ratios. Beginner (1:2 ratio) 20s work / 40s rest or 30s work / 60s rest, focuses on building fitness. Intermediate (1:1 ratio) 30s work / 30s rest or 40s work / 40s rest, balances endurance and power. Advanced (2:1 ratio) 40s work / 20s rest or Tabata (20s/10s), maximum intensity and efficiency. Heart rate-based intensity control: Max HR = 220 - age. High-intensity zone: 85-95% of max HR, rest zone: 60-70%. Example: Age 30 max 190 bpm → high-intensity 161-180 bpm, rest 114-133 bpm. Monitor with smart watch or 10-second pulse count × 6.

6-Week Beginner Interval Program

A safe and effective 6-week progressive program for starting interval training. Week 1: 30s work / 60s rest × 5 rounds, 2x/week, basic moves like jumping jacks, squats. Week 2: 30s work / 45s rest × 6 rounds, 2-3x/week, add lunges, high knees. Week 3: 30s work / 30s rest × 8 rounds, 3x/week, introduce mountain climbers. Week 4: 40s work / 20s rest × 8 rounds, 3x/week, add squat jumps. Week 5: 40s work / 20s rest × 10 rounds, 3-4x/week, introduce burpees. Week 6: 20s work / 10s rest × 8 rounds (Tabata challenge), 3x/week. Essential safety rules: 5-10 min warmup (dynamic stretching), 5-10 min cool-down (static stretching), 48-hour recovery between sessions, stop immediately if dizzy or nauseous.

Practical Interval Tips - Success Strategies

Real-world strategies to maximize interval training effectiveness. Pre-workout: Fasted training increases fat burn by 20% (watch for dizziness), 300-500ml water 30 min before, caffeine intake (3-5% intensity boost). During workout: Fast music BPM 140-180 (15% intensity increase), first 2-3 rounds at 80% intensity for warmup, breathe in through mouth, out through mouth. Post-workout: Protein + carbs within 30 min (muscle recovery), adequate sleep (growth hormone release). Track progress: Workout log (date, rounds, rest time), monitor heart rate, weight, body fat %, change exercises every 4-6 weeks (prevent plateau). Appropriate frequency: Beginners 2-3x/week, intermediate 3-4x/week, advanced 4-5x/week (watch for overtraining). Rest days are mandatory—light yoga or stretching is OK!

Häufig gestellte Fragen

What is the difference between Tabata and general HIIT?

Tabata is a fixed ultra-high-intensity protocol: 20s work / 10s rest × 8 rounds (4 minutes total). General HIIT uses 20-40s work / 10-60s rest, allowing more flexible intensity adjustment.

How many interval sessions per week are appropriate?

Beginners 2-3x/week, intermediate 3-4x/week, advanced 4-5x/week. A 48-hour recovery between sessions and rest days are essential.