This is a really difficult game to describe how to play, but once you understand and get the hang of it, it really is a great game.
Fresh is an ideal game to play on the beach, but you could also play it on a sporting field or in a park.
Split into two teams and draw out a rectangle playing field (about 20-30m long, 10m wide). One team starts up one end of the rectangle, the other up the other end. The idea is to enter the playing field (rectangle) and 'tag' someone from the other team....But, you can only tag people if you are "fresher" than them. The longer you are in the rectangle, the less fresh you are. In other words you can only tag people who are already in the rectangle when you enter.
Because of the length of the playing field, when you run to tag someone, someone from the other team could then run in and tag you (because they are fresher) so there ends up being a lot of back and forth.
When you are 'tagged' you are captured by the other team and must stand up their end of the field in 'jail' with your foot on their end zone line. When other people from your team are captured, they are also captured but can stand linking hands to make a line back into the rectangle.
If you're quick enough, you can 'save' captured team members by running up and tagging them when they are captive, but beware because you have to entering well into enemy territory and risk getting caught/tagged yourself!