https://www.yahoo.com/lifestyle/ditch-sit-ups-4-move-070131347.html
https://www.yahoo.com/lifestyle/ditch-sit-ups-4-move-070131347.html
WWW.YAHOO.COM
Ditch the sit-ups — this 4-move bodyweight workout builds your core and improves posture at the same time
This workout requires no equipment and just four moves to strengthen your core muscles and boost your balance.
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