I do believe it's all of the above. Although, it might not be trouble sleeping. That might be true in some cases, but not in all.
If the male is more dominant he can force the woman into having sexual intercourse with him. This can spread HIV especially if the man had been sleeping around.
The Swiss developmental psychologist Jean Piaget used the term assimilation to explain the process in which people understand an experience in terms of their current stage of cognitive development and way of thinking. Assimilation is included in the adaptation process and includes the learning of new information and incorporation of that new information into our existing knowledge.
Crunches
In my educated opinion, crunches would be the best choice out of these options to build strength. A one mile run builds cardio, sit and reach and gymnastics build flexibility and some strength, crunches is strictly abdominal strength.
