Strengthening the core muscles is key to good health and preventing back pain; however, some core exercises also expand the waistline, causing the midsection to look big and blocky. Isometric exercises, such as side planks, farmer carries, and stomach vacuums for the transverse abdominis, strengthen the core without making it larger.
Read MoreThe stomach vacuum exercise can help tighten your midsection by activating the deep muscles of your abdomen.
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