Wolfram's "Starting Strength" Log

[cbloom]

Yeah, don't be afraid to take time off or just go really light. Stick to the program! That means if you can't do your 5 reps with good form (eg. hips do NOT curl under when you squat low) - then stick with lighter weight until you can get your form up. Don't just keep raising the weight until "it's hard enough" if your form is no good!

If you're injured, now is a good chance to take some time off and stretch so that you have the flexibility to do the move safely.