Kelly, who lost a significant amount of weight last year, has a new fitness centre to go to and is enjoying her new workout regime.
Writing in her British Closer magazine column, the 26-year-old said: 'I've started hitting the gym over the past few weeks, like never before! It's because I just love my new gym, and exercising gets my endorphins going and it really lifts my mood.
'I've been trying out some new things too - I hate running, but my fitness trainer showed me a different way to do it. You run for a minute on and off and, before you know it you've done half an hour on the treadmill without even realising.'
Osbourne is loving the gym so much at the moment that she is using it as a place to meet up with her friends.
Kelly added: 'The new gym is actually a great place to hang out - it's close to where I live and I see all my friends there.
'Funnily enough, it's kind of the same mentality as going to the pub to hang out - it's just the other end of the spectrum.'