Split class into groups of 4-5. Each team will have one person that starts behind the stumps (wicketkeeper) and the rest of the team will be behind a cone that is 10 yards away from the stumps with a ball each, from where they will bowl from. When the coach starts the bowling relays one person at a time from the bowling line will attempt to bowl their ball at the stumps, immediately after bowling they will run to take up the position of the wicketkeeper behind the stumps, while the first wicketkeeper will collect the ball that was bowled and join the bowling line. If the ball hits the stumps with more than 1 bounce or 0 bonces the team will be arwarded 1 point, if the ball hits the stumps after only 1 bounce the team will be awarded 2 points. The team with the most points at the end of the relay wins.
Put the stumps further away from bowling line. Have coloured spots in front of the stumps to aim for to get more points. use rubber cricket balls instead of tennis balls.
Underarm bowling. Allowed unlimited amount of bounces before hitting the stumps. move the stumps closer.