HIIT is fastest. High Impact interval training
walk 1 minute, sprint 1 minute, walk 1 minute, Sprint 1 minute.
do that about 16 minutes a day.
http://www.exrx.net/FatLoss/HIITvsET.html
I have lost my Man boobs so I cannot help you with the Bra question

Overall, the evidence suggests that HIIT is the most efficient method for achieving fat loss. However, HIIT carries a greater risk of injury and is physically and psychologically demanding (10), making low- and moderate-intensity, continuous exercise the best choice for individuals that are unmotivated or contraindicated for high-intensity exercise
http://www.wsu.edu/athletics/strength/hiit.htm
Jag