I do teach my clients that a temporary increase in symptoms is acceptable, as long as the distal symptoms do not remain worse as a result, or peripheralise.
The most therapeutic exercises (loads) will be those that can be self administered by the client 24 hours a day. These loading strategies may initially result in an INCREASE or NO WORSE response. A temporary increase in symptoms is not a sign to STOP a particular exercise (loading strategy). I suggest clients work at home with what I have taught them to explore the INCREASE or NO WORSE response. I often see clients return with a clear BETTER response a few days later.
For low back clients, I do like to start with attempts at achieving further extension in lying (press ups).
If you have any questions call me on my cell phone.