Run around your block
Repeat the following sequence as many times in 20 minutes
5 burpees w/push up
20 russian twists (can add weight)
20 sit ups
50 mountain climbers
Added weight could be: water bottles, pots and pans, a rock from your backyard, you can fill a bag with heavy things around your house, be creative! You can also buy cheap weights at Ross, TJMax, and Marshalls!