Working out is hard enough. To do so in dour surroundings that provide no real motivation can be boring and have you giving up before you even start. So you ought to love the prospect of outdoor group training in Sydney if ever it presents itself.
Breathing in fresh air is so normal that it lends itself to being a little obvious. However, in nature you have nice, clean oxygen to keep your workout going. Oxygen is good for a number of aerobic processes, key amongst them being the release of energy.
“Outdoor” is very, very broad in meaning. It can even mean playing a game of tennis, football or basketball. It can also imply taking part in rigorous outdoor activities, like mountain climbing. For as long as you’re sweating and burning fat, you’re on the right track. Be creative.