Navy deep-sixes the sit-up
Testing our servicemen and women for physical fitness has long included the sit-up as a measuring stick for core strength. This despite the fact that the evidence indicates the forward-bending or flexion movement of...
low back
Strengthen your core, spare your low back
Strengthening core muscles can improve balance and stability and are an important part of fitness routines that have "real-world benefits". Doing this strengthening in a way that spares the low back has been promoted...