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This will likely hurt.
And it’s supposed to.
In fact, if it doesn’t, you’re probably doing it wrong, and will not get much benefit.
However, it should hurt, not harm.
The hurt should be your muscles protesting being used in ways that they are not used to being used, and with greater force and weight.
Not the sharp pain of tearing a ligament or straining.
If you aren’t sure, stop. Ask at the gym for someone to show you have to keep proper form for these movements, so you don’t injure yourself or your fuck muscles.
And see a doctor before starting any sort of sexercise—I mean exercise—program.