An isometric exercise is a form of exercise involving the static contraction of a muscle without any visible movement in the angle of the joint.
I think it is be division
The chromatids are made of a substance called chromatin. This is a single, very long strand of DNA. ... The chromatin is copied, so you now have 92 strands, that are each spiraled up to form the chromatids. The 2 copies of each chromatid are joined together by a centromere to form a chromosome.
