Example of the physical qualities assessed in the test battery used by the DTB as well as average values and SDs for U12 to U18 female players
| Female players | |||||
|---|---|---|---|---|---|
| Qualities | Measurements | U12 (n=65) | U14 (n=149) | U16 (n=73) | U18 (n=37) |
| Anthropometry | Height (cm) | 149.5±6.4 | 160.5±6.9 | 167.3±5.8 | 171.5±6.5 |
| Weight (kg) | 38.1±6.4 | 48.7±7.2 | 57.5±6.7 | 63.4±6.3 | |
| BMI | 17.0±1.9 | 18.8±1.8 | 20.5±1.9 | 21.5±1.7 | |
| Strength and power | Grip strength* (kg) | 20.6±4.1 | 27.4±5.2 | 32.1±4.0 | 35.7±5.0 |
| CMJ (cm) | 28.6±4.0 | 29.8±3.8 | 31.1±3.6 | 31.1±3.9 | |
| Medicine ball throw† (cm) | 505.5±92.1 | 611.2±96.2 | 709.8±105.7 | 788.3±124.8 | |
| Service velocity (km/h) | 112.2±9.2 | 127.8±10.6 | 142.3±10.3 | 150.9±8.3 | |
| Speed and agility | 10 m (s) | 2.03±0.09 | 1.98±0.08 | 1.96±0.15 | 1.96±0.09 |
| 20 m (s) | 3.61±0.14 | 3.5±0.14 | 3.41±0.14 | 3.38±0.19 | |
| Shuttle sprint FH (s) | 3.11±0.13 | 2.99±0.13 | 2.88±0.11 | 2.88±0.13 | |
| Shuttle sprint BH (s) | 3.21±0.16 | 3.12±0.15 | 3.03±0.17 | 3.05±0.14 | |
| Endurance | Hit & Turn Test (level) | 11.8±2.0 | 12.7±1.9 | 13.8±1.9 | 14.3±1.8 |
*Dominant hand. †Overhead medicine ball. BH, backhand; BMI, body mass index; CMJ, countermovement jump; DTB, German Tennis Federation; FH, forehand.