What I do...
Wile standing up, w/your feet at a good stance I suck my gut in and twist/punch side to side -I punch upwards to the right then upwards to the left... on and on for 50-75 / then I do 50-75 twist punches at chin level / then 50-75 in a downward motion. Depending on my skill level at the time I will use 3 or 6 lb. weights.
Then I also stand still and do side bends feeling a big stretch.... 100 times. Also, you can use weights (little ones). Good luck!
current weight: 180
goal weight: 140
all because I over ate