On the other hand, the Twitterverse and all its friends have caused great caution among those New Yorkers, so conclude Freeman, because image and career mobility mean more than getting sweaty.

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But unlike the U.S. and Germany -- where childcare is cited as the major factor for why women leave work -- in Japan, uncompromising work environments, which demand face-time and offer little career mobility for women, persuade most mothers to give up corporate life.

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Time against this goal ranges from internal leadership forums, weekly skip levels and chats with front line employees, initiatives to build a great environment for our engineers and product leaders, as well as focusing on areas such as advancing career development and mobility within the company.

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Mr Clegg, who has acknowledged he benefited himself from family contacts early in his career, said social mobility was a "complex" issue and could not be improved overnight.

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This charity has campaigned to improve the quality of careers education, highlighting the link between social mobility and access to career advice and work experience.

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He also insisted he isn't concerned about taking hits, and still has some of the mobility that made him such a dynamic player earlier in his career.

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