English to Russian Other Sports / Fitness / Recreation

Tennis is a very complex, open sport. An open sport is defined as a sport that has changing variables, compared to a closed sport like gymnastics where the athlete’s performance is not affected by an opponent or by external circumstances such as court surface.

Возможно, здесь неточность в оригинале, т.к. в других источниках речь идет о closed/open skills:

Open skills: sports such as Netball, Football, and Hockey usually involve open skills. This is because the environment is constantly changing and so movements have to be continually adapted. Therefore, skills are predominantly perceptual. The skill is mostly externally paced, for example a pass in football.

Closed skills. These skills take place in a stable, predictable environment and the performer knows exactly what to do and when. Therefore, skills are not affected by the environment and tend to be habitual. Movements follow set patterns and have a clear beginning and end. The skills tend to be self-paced, for example a free throw in Basketball, and serving in Squash or Tennis.
(http://www.brianmac.co.uk/continuum.htm)

Если есть возможность как-то назвать эти виды навыков без применения прилагательных "открытый" и "закрытый", это было бы замечательно, поскольку "открытость" в теннисе имеет специфическое значение.

Спасибо