Letterman has no plans to give up his television gig ... The human mechanism will not allow you to retire. What do [people] do? Sit there and wait for ‘Judge Judy’ to come on?” ...
Sit-ups are great for strengthening the core but doing sit-up after sit-up gets a little boring and it's important to mix up the moves you use to train your core. With this in mind, we've found a ...