Date of birth (in day/month/year to subsequently determine age) Gender: male or female Dominant upper extremity: right or left Dominant lower extremity: right or left Playing experience (in years) Average training hours (in hours per week)

These values will be determined cross-sectionally and reported as mean and standard deviation.

Stature (cm) Weight (kg) Body Mass Index (kg/m²) Upper extremity length (cm) Lower extremity length (cm)

These values will be determined cross-sectionally and reported as mean and standard deviation.

1. Whole body composition: dual energy x-ray absorptiometry. Fat mass (g) lean mass (g) Bone mass (g) Bone mineral content (g) Bone mineral density (g/cm²) Bone area (cm²)
2. Muscle thickness and subcutaneous fat layer: Ultrasound. Thickness of the subcutaneous fat (in mm) and muscle thickness (in mm) of the dominant and non-dominant M. Biceps Brachialis, M. Triceps Brachialis, M. Rectus Abdominis, M. Quadriceps Femoris and Hamstrings.
3. Circumferences: anthropometric tape measure. Upper and lower arm (in cm) Upper and lower leg (in cm)

These values will be determined cross-sectionally and reported as mean and standard deviation.

In addition, all these outcome measures will be determined and reported for both the dominant and non-dominant upper and lower extremity separately.

Side-to-side difference (i.e. dominant versus non-dominant upper and lower extremity) will be calculated and expressed as a percentage (extremity symmetry index (%)) for the outcome measures described above (i.e. fat mass, muscle mass, bone mass, bone mineral content and bone mineral density).

Extremity symmetry index = (measure dominant extremity or side / measure non-dominant extremity of side - 1) x 100