His physics mind shoots thunderbolts, his body flips in somersaults

A limerick on a birthday of a neighbor who’s both an accomplished scientist & in his youth gymnast:

There was a youngish man called Igor
who treats all he meets with ardor

a man of great science
with strong self-reliance

Among Norse gods resembles most Thor!

*)
Why Thor? Because they both rather swing a thunderbolt hammer than just sit around and yammer