NHS worker Amy Newall, 31, lost six-and-a-half-stone (91lb) and trimmed her dress size from a size 20 to a size 8 through four years of hard work attending bootcamps and one-on-one personal training sessionNHS worker Amy Newall, 31, lost six-and-a-half-stone (91lb) and trimmed her dress size from a size 20 to a size 8 through four years of hard work attending bootcamps and one-on-one personal training session