J’aimerais inscrire mes enfants aux cours de tennis, mais ils sont un peut être un peu jeunes. A quel âge peut-on commencer ? Un prof de tennis qui encadre des enfants répond à nos questions.
A quel âge les enfants peuvent-ils commencer le tennis ?
Les clubs acceptent en principe les enfants dès 4 ans. Certains clubs acceptent les enfants dès 3 ans, mais c’est assez exceptionnel.
Les clubs ont-ils une section pour les tout-petits ?
La section qu’on nomme mini tennis qui regroupe des enfants de 4 à 6 ans en général.
Les règles et le matériel sont-ils adaptés ?
Les raquettes sont plus petites et plus légères. On s’adapte à l’âge en faisant des jeux de ballons à faire rouler au sol. On utilise des balles en mousse et des ballons de baudruche. On introduit le tennis en restant ludique, tout en s’amusant.
A quoi ressemble un entraînement pour les tout-petits ?
En général, les entraînements durent 1 heure. Il peut y avoir 1 à 2 cours par semaine : mercredi et samedi. Cela comprend généralement un échauffement, des jeux collectifs et éducatifs. On travaille ainsi la tenue de la raquette, la lecture de la trajectoire de la balle et la coordination. On apprend la technique du coup droit et du revers et enfin le service. On termine toujours le cours par un jeu collectif.
A quel âge peut-on commencer à faire des matchs et des tournois ?
Officiellement, la compétition et les classements commencent à partir de 8 ans. Cependant il existe des minis tournois de découverte entre les enfants du club.
Les matchs sont-ils adaptés aux enfants ?
Le format des matchs est adapté à l’âge de l’enfant : les balles sont molles, le terrain est réduit et la durée des matchs est écourtée.
Par: Thomas Revest
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Understanding COSC Accreditation and Its Importance in Watchmaking
COSC Accreditation and its Strict Standards
COSC, or the Official Swiss Chronometer Testing Agency, is the official Swiss testing agency that attests to the precision and precision of wristwatches. COSC validation is a symbol of quality craftsmanship and dependability in timekeeping. Not all watch brands seek COSC accreditation, such as Hublot, which instead follows to its proprietary strict criteria with mechanisms like the UNICO, reaching equivalent accuracy.
The Science of Exact Timekeeping
The core system of a mechanized timepiece involves the spring, which provides energy as it loosens. This mechanism, however, can be prone to external elements that may influence its accuracy. COSC-accredited movements undergo rigorous testing—over fifteen days in various conditions (5 positions, 3 temperatures)—to ensure their durability and dependability. The tests assess:
Average daily rate precision between -4 and +6 secs.
Mean variation, peak variation rates, and impacts of thermal variations.
Why COSC Certification Matters
For timepiece enthusiasts and collectors, a COSC-validated watch isn’t just a item of tech but a demonstration to lasting quality and accuracy. It represents a watch that:
Provides excellent dependability and accuracy.
Ensures guarantee of quality across the whole construction of the watch.
Is likely to hold its worth more effectively, making it a wise choice.
Well-known Chronometer Manufacturers
Several famous manufacturers prioritize COSC certification for their timepieces, including Rolex, Omega, Breitling, and Longines, among others. Longines, for instance, presents collections like the Archive and Soul, which highlight COSC-accredited mechanisms equipped with advanced substances like silicone balance suspensions to boost durability and performance.
Historical Background and the Evolution of Timepieces
The idea of the chronometer originates back to the need for accurate chronometry for navigation at sea, highlighted by John Harrison’s work in the eighteenth century. Since the formal foundation of COSC in 1973, the validation has become a benchmark for evaluating the accuracy of high-end watches, continuing a tradition of excellence in watchmaking.
Conclusion
Owning a COSC-accredited timepiece is more than an visual choice; it’s a commitment to excellence and precision. For those valuing accuracy above all, the COSC validation provides tranquility of mind, ensuring that each certified watch will function dependably under various conditions. Whether for personal satisfaction or as an investment decision, COSC-validated watches distinguish themselves in the world of horology, bearing on a legacy of precise timekeeping.