exercise does not effect, you can do any exercise you want. exercise makes you in better shape to enjoy sex more and last longer.
What type of foreplay, if you get tired, rest, from actual intercourse and use your hand. Also start with hand or oral for a bit, and get him closer, if the need is for him to finish.
The issues you are not taking about are the important issues. Knowing when you ovulate not by chart but actual ovulation. That needs to be tracked to predict future dates. Sex needs to be refrained for time before and then sex the 2 to 4 days prior to ovulation.
