TA PTI's have to do a refresher course every 3 or 5 years (can't remember which one now). Two of our lads have just come back and said that it was really hard - one failed. Apparently regardless of the age of the PTI, he must do his 1.5 mile run in under 10 mins. Also, if you are doing your sit ups with your arms crossed over your chest - if your arms slip or you accidentally let go of your top at any time - you have to start again. Also with the pressups, your palms must be on the floor level with your shoulders and again if one hand moves - you start again. I think someone at PTI world is having a giraffe.