Focus on strengthening weak muscles, avoid explosive movements, and increase workout intensity gradually. (fitnessandpower.com)
The increase in workout intensity occurs because you are able to squeeze more work into a shorter time frame. (build-muscle-and-burn-fat.com)
Note that most sports bras are rated for workout intensity, so that a bra made for yoga, may not be a good pick for marathon training. (pregnancymagazine.com)