This is a repost from a couple of months ago..............
I deal with this alot with my own clients and especially my athletes and what I'm going to say, you're not going to like, but I'll try to explain it so it will make sense.
Even though your primary muscles are strong enough to pull the weight, you're stabilizers haven't recovered enough to sustain the pulling of your primary muscles, you stabilizer in this case would be your psoas, it's the muscle that runs from the lower lumbar to almost your adductor
the only way to strengthen your low back and psoas to get back your original strength is to train your low back indirectly by doing unilateral leg training (light and progressivly working heavier) then after a 2-3 weeks progressing to two legs then eventually adding loads. incorporating core work such as working transverse abdominus will also be a huge benefit.
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