Just because the baby is playing doesn't mean mommy can't be working! Doing playtime planks will help keep your baby active with new toys and you active by activating those abs and giving you back that 6 pack you had in college. Not to mention it will keep your house clean from all those toys.
Get into a high plank position by putting your feet on the ground, getting your hands underneath your shoulders and elbows extended. Make sure you are close enough to reach both your baby and the toys and use one arm to grab a toy and put it away on the shelf. Keep your arms close to your body even when reaching out so you don't cause any pain in your shoulders.