An interesting question! Having been involved in Rock'n'Roll and Swing dancing for many years, lifting a partner is a skil one has to learn.
The effect you are describing is not so much that the person being lifted is able to resist lifting, rather thay stop co-operating in the lift.
One move my partner and I do is called the "Cartwheel". She stands in front of me with her arms and legs spreadeagled (like in a star jump) I lean over to my right and grasp her around her waist with my left arm around her right side and vice versa.
I then turn her like a "cartwheel" and she ends up on my left side and we dance out.
Interestingly, if she does nothing it is nearly impossible, she becomes a deadweight and very hard to flip over. All she needs to do is give a seemingly tiny push with her feet as I lift and make sure her core is tense and it is the easiest thing in the world. A tense core is the main thing in lifting along with the person being lifted doing a little bit.
Malcolm
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