(If you click on them they become bigger)
Of course you can mount a fixed any way you like. But most people riding fixed don't use the traditional mount, where you swing the leg up and back over the saddle. Instead, they use the much cooler handlebar mount. They sweep their leg in a quick movement up in front, over the handlebars and back down to the pedal on the opposite side. This method is faster and smoother than the traditional mounting method. It evolved on track bikes, where the bars are a good deal lower than the saddle--and there are no brake cables to foul you up!