How to stop saggy skin?!?!

Sorry guys another question, new to this so ill get all my questions out the way now!

My friend has lost 7st on LL and has saggy skin all over her stomach im now scared im going to get it too! were both 23 so will the skin 'ping' back?

I got about 4 stone to lose, any tips on how to beat saggy skin before it sets in??
 
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