No your feet can be on the ground.
A table tennis table is 2 feet 6 inches (76cm) high.
The tennis balls serve several purposes. They make it easier for the walker to slide across the floor, rather than the friction from the rubber bottoms. They also prevent scuff marks on the floor. The tennis balls on walkers serve a dual purpose. First, they allow the person that is using the walker to
Sports where you serve a ball include tennis, volleyball, badminton, table tennis, and pickleball. In tennis, the serve starts each point, while in volleyball, the serve initiates play and is crucial for scoring. Badminton and table tennis also require a serve to start each rally, and in pickleball, the serve is used to begin each point as well.
A table tennis table is 9 feet (2.74 m) long, 5 feet (1.525 m) wide and 2 feet 6 inches (76 cm) high from the floor. The net is 6 feet (1.83 m) long and 6 inches (15.25 cm) high.
You can hit an underhand serve in tennis; however, the overhand serve is more effective because it is more powerful. That is why you don't see the underhand serve used much.
a serve
Badly.
A tennis ball!
There are 7200 square feet in a tennis court. A tennis court measures 120 feet over all court area by 60 feet wide.
It depends on how hard you want to hit the ball
a tennis ball