Let's break the exercise down to see what the options are:
It's a single joint, hip extension action. So as long as you perform that movement, you're fine.
You can do back extensions on a swiss ball.
Failing that you could do reverse hypers, hip extension 'bridges' (feet on bench/ball, shoulders on floor - lift hips up as high as possible), good morning, romanian deadlifts etc.
If you are already doing these exercises, then an additional set will likely be all you need.
AC
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