here with the best ways to sign off is rebecca greenfield.telling us, you are getting a lot of feedback on this. >> some people really appreciate it, they say thank you and have changed my life. some people are really angry at and areg they use best not changing my ending. best butontinue using it is meaningless and empty and can come off as short. just for your self from best. betty: did she just call me meaningless and empty? mark: what are some of the other ways people are not signing off? >> people still you sincerely. no signticle i push for off, just and the e-mail. mark: i think thanks might be the best option. betty: some people do use e-mail as a formal letter. one if you are doing that and went to do it professionally? >> use your judgment. context really helps with all of this. i think for a lot of cases if you see it and rewrite the with ain a way that ends thoughtful thought or question, you don't need the ending. wow. rebecca greenfield, i don't know what to do now. you could see the whole story at bloomberg.com. how does the st

as bloomberg's rebecca greenfield reports, she is not a fan.xplain why. >> i've got my sneakers. i'm ready to go. >> there's something going on at workplaces that i'm not sure i approve of. people are working out at work with their coworkers. i'm going to give it a shot. i'm headed downtown to a workplace boot camp at an advertising company. seems a little fancy for a workout. these are their offices where they've cleared out the chairs and tables to make a makeshift workout space and hired dmo -- guillermo to run the boot camp. >> move those arms. 1, 2, 3, 4. >> generally, it works like this. healthier employees are cheaper to ensure. hr departments have started to incentivize exercise at the office. people who participate pay lower premiums and in the long run save money. >> 3, 2, 1. >> i don't love this idea. i'm not sure i want to sweat and wear spandex in front of my boss and colleagues for obvious reasons. >> very good. >> i think the biggest benefit is, we can bond with each other outside of just drinking a beer. instead, we are working