Respectively the species of Planet Earth, humans tend to be very extremely weak, with only a power level of 3 or 4 compared to other much more powerful races such as the Saiyans or Nameks.
Energy control would be quite a difficult task for humans, but intense training would pay off eventually. The strongest humans are Krillin, Tein and Yamcha, who did very well with their mastering of beam attacks, flying, sensing power levels etc. However, once the Super Saiyans emerged they were very quickly outclassed.
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