Police say this has happened over the past few weeks at the LA Fitness in Huntingdon Valley.
Surveillance videos of the suspects were released on Monday.
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In one case, a woman is accused of entering the gym on East County Line Road without swiping a member card. Police say she made her way to the locker room where she took someone's keys and a wallet.
The woman then used the keys to get into the victim's vehicle and took another wallet. The victim's credit cards were used to buy gift cards at a nearby pharmacy, according to police.
Police say a male suspect committed a similar theft and used a victim's credit card at Walmart.
If you have any information, call Upper Moreland Police at 215-657-4700 or email amisner@uppermoreland.org.