I had a particularly hard strength training session on the turbo today (Z4/5) and I cracked half way through, my legs were OKish but my head cracked at the end of a Z5 rep.
I have tried the usual, looking out the window, radio etc but is there any little tips that others use that I could try...other than growing a pair obviously!
Take each rep at a time. If I have a brutal trainer session planned I try not to think in terms of 5-10 reps of suffering. I think in terms of one quality rep at a time, planned recovery then complete the next rep.
I also don't set a target for number of reps just count the number of quality reps performed. Some days will be good and some will be bad. Once you crack there is no sense in finishing the workout. That is just pointless overload and training the body to ride slow.