Back Extension
| Muscle Group | Muscles |
|---|---|
| Primary Muscles | Erector Spinae |
| Secondary Muscles | Gluteus Maximus, Hamstring |
| Stabilizer Muscles | Abdominal External Oblique, Trapezius |
| Grip Muscles | None |
| Level | ||
|---|---|---|
| Beg. | < 1 | < 1 |
| Nov. | 7 | 6 |
| Int. | 28 | 20 |
| Adv. | 55 | 38 |
| Pro | 87 | 58 |
Note: These standards are based on the average lifter and may vary depending on individual factors such as body weight and age. More detailed data is provided below.
| BW | Beg. | Nov. | Int. | Adv. | Pro |
|---|---|---|---|---|---|
| 50 | < 1 | < 1 | 22 | 52 | 88 |
| 55 | < 1 | 3 | 24 | 53 | 87 |
| 60 | < 1 | 5 | 25 | 53 | 86 |
| 65 | < 1 | 6 | 26 | 53 | 84 |
| 70 | < 1 | 7 | 27 | 53 | 83 |
| 75 | < 1 | 8 | 28 | 53 | 81 |
| 80 | < 1 | 9 | 28 | 52 | 80 |
| 85 | < 1 | 9 | 28 | 52 | 78 |
| 90 | < 1 | 9 | 28 | 51 | 76 |
| 95 | < 1 | 10 | 28 | 50 | 75 |
| 100 | < 1 | 10 | 28 | 50 | 73 |
| 105 | < 1 | 10 | 28 | 49 | 72 |
| 110 | < 1 | 10 | 28 | 48 | 70 |
| 115 | < 1 | 10 | 27 | 47 | 69 |
| 120 | < 1 | 10 | 27 | 46 | 68 |
| 125 | < 1 | 10 | 27 | 46 | 66 |
| 130 | < 1 | 10 | 26 | 45 | 65 |
| 135 | < 1 | 10 | 26 | 44 | 64 |
| 140 | < 1 | 10 | 26 | 43 | 62 |
| Age | Beg. | Nov. | Int. | Adv. | Pro |
|---|---|---|---|---|---|
| 15 | < 1 | 1 | 19 | 43 | 69 |
| 20 | < 1 | 6 | 26 | 53 | 84 |
| 25 | < 1 | 7 | 28 | 55 | 87 |
| 30 | < 1 | 7 | 28 | 55 | 87 |
| 35 | < 1 | 7 | 28 | 55 | 87 |
| 40 | < 1 | 7 | 28 | 55 | 87 |
| 45 | < 1 | 5 | 25 | 51 | 81 |
| 50 | < 1 | 3 | 22 | 46 | 74 |
| 55 | < 1 | < 1 | 18 | 40 | 66 |
| 60 | < 1 | < 1 | 14 | 34 | 58 |
| 65 | < 1 | < 1 | 10 | 28 | 49 |
| 70 | < 1 | < 1 | 7 | 22 | 41 |
| 75 | < 1 | < 1 | 3 | 17 | 34 |
| 80 | < 1 | < 1 | < 1 | 12 | 27 |
| 85 | < 1 | < 1 | < 1 | 8 | 21 |
| 90 | < 1 | < 1 | < 1 | 5 | 16 |
| BW | Beg. | Nov. | Int. | Adv. | Pro |
|---|---|---|---|---|---|
| 40 | < 1 | 6 | 22 | 43 | 66 |
| 45 | < 1 | 7 | 22 | 42 | 63 |
| 50 | < 1 | 7 | 22 | 40 | 60 |
| 55 | < 1 | 8 | 21 | 39 | 58 |
| 60 | < 1 | 8 | 21 | 37 | 55 |
| 65 | < 1 | 8 | 20 | 36 | 53 |
| 70 | < 1 | 8 | 20 | 35 | 51 |
| 75 | < 1 | 7 | 19 | 33 | 49 |
| 80 | < 1 | 7 | 18 | 32 | 47 |
| 85 | < 1 | 7 | 17 | 31 | 45 |
| 90 | < 1 | 7 | 17 | 30 | 43 |
| 95 | < 1 | 6 | 16 | 28 | 42 |
| 100 | < 1 | 6 | 15 | 27 | 40 |
| 105 | < 1 | 6 | 15 | 26 | 39 |
| 110 | < 1 | 5 | 14 | 25 | 37 |
| 115 | < 1 | 5 | 13 | 24 | 36 |
| 120 | < 1 | 5 | 13 | 23 | 35 |
| Age | Beg. | Nov. | Int. | Adv. | Pro |
|---|---|---|---|---|---|
| 15 | < 1 | 1 | 13 | 28 | 45 |
| 20 | < 1 | 5 | 19 | 36 | 55 |
| 25 | < 1 | 6 | 20 | 38 | 58 |
| 30 | < 1 | 6 | 20 | 38 | 58 |
| 35 | < 1 | 6 | 20 | 38 | 58 |
| 40 | < 1 | 6 | 20 | 38 | 58 |
| 45 | < 1 | 5 | 18 | 35 | 53 |
| 50 | < 1 | 2 | 15 | 31 | 48 |
| 55 | < 1 | < 1 | 11 | 26 | 42 |
| 60 | < 1 | < 1 | 9 | 21 | 36 |
| 65 | < 1 | < 1 | 6 | 16 | 30 |
| 70 | < 1 | < 1 | 2 | 12 | 24 |
| 75 | < 1 | < 1 | < 1 | 8 | 18 |
| 80 | < 1 | < 1 | < 1 | 5 | 13 |
| 85 | < 1 | < 1 | < 1 | 1 | 9 |
| 90 | < 1 | < 1 | < 1 | < 1 | 6 |
Note: The dumbbell weights listed in the table refer to the weight of a single dumbbell. Standard gym barbells typically weigh 20 kg / 44lbs.
| Level | Description | Percentile |
|---|---|---|
| Beg. | Adopt correct form and continue with your workouts for over a month. | Bottom 5% |
| Nov. | Continue with your workouts consistently for over 6 months. | Top 80% |
| Int. | Continue with your workouts consistently for over 2 years. | Top 50% |
| Adv. | Continue with your workouts consistently for over 5 years. | 上位 20% |
| Pro | Specialize in the workout routine for over 5 years. | Top 5% |
| Intensity | Calories Burned |
|---|---|
| Easy | 🔥 25~35 Calories |
| Medium | 🔥 40~55 Calories |
| Hard | 🔥 60~75 Calories |
| Max | 🔥 80~100 Calories |
Note:These are estimated values for an average adult. Actual calorie burn may vary based on individual factors such as weight, muscle mass, and exercise form.
Intensity Levels: