So if you work out, your inner thighs to create a thigh gap, what you're essentially doing is building muscles in that area. If you give in to temptation, do not be discouraged! She was a frequent visitor to thigh-gap sites. I want my thighs to be bigger and stronger. Physical results could take as long as three to four weeks to start showing. A question and topic we often encounter is Fitness girls with thigh gap to get a thigh gap.