I am a "mature" but in-shape guy... work-out 3/week and usually with a trainer/coach...
Did five sets of squats, then moved onto barebell deadlifts. Made it to fifth rep of first set with my trainer watching to ensure good form and then I felt that crippling lower back spasm! Had to be helped onto the massage table for him to work it out, and then we tried to do some stretches to relieve the tightness. Really bad pain for about a week, especially when getting up or sitting down (no problem when I am up and walking!) Saw the doc, who told me it's just muscular, nothing that requires medical intervention and that NO PERSON SHOULD EVER DO A DEADLIFT.
Seeking advice: to me deads are crucial... Agree or not? And what should I be doing either to get myself back to being able to do deads or in place of them? Need help - this is really bumming me out!