You can do any activity as either aerobic or anaerobic. It just depends on the intensity and what your own body can do. The burning sensation after a few minutes is the lactic acid produced when you do anaerobic exercise. It comes because your body is not able to deliver oxygen to your muscles fast enough. If you take it a bit more calm, waiting a bit between pushup repetitions and sets, slowing down the run to more of a jog, etc. then your muscles is not using oxygen faster then it can be delivered and you will be in the aerobic range. As you get more fit your body will be able to deliver more oxygen to your muscles so you can run faster and take pushups faster.
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