How do they go super sayian?

I don’t know if this is explained in the series and I’m just missing it but, it’s wild to see these two go super sayian so easily without the training it took their fathers to do the same. My head cannon is that since their fathers were able to go super sayian when they were conceived, and sayian children are genetically predisposed to be stronger than their parents. This must mean that to be stronger they would have to be able to go super sayian just as easily as their parents can now.

Is this an absurd head cannon or am I onto something?