I agree with the danger aspect of doing a clean and jerk type movement or cheat curling your bodyweight but we are talking about maximal effort are we not. How do we express maximal if we don't discover it in training? I feel if we stop short of maximal full body strength activities then we won't be able to use ourselves in the same way on the track. Cerutty doesn't approve of much sub-maximal strength training as you probably know.
So whilst there is danger it is to be faced and overcome. The benefits on the other side are obviously worth it according to Percy.
The 3 sets of 6 i like and i feel is the upper end of the range of maximal strength development training. 4 sets of 4 is the other end. Three reps and down is the strength/power range and 7-10 is the strength endurance range. At least from my perspective. You need the endurance to support the maximal strength which then supports the ability to do the strength/power movements in the range of one to three reps.
As a comparison there are strength/speed movements such as shotput. Lower resistance higher speed but still a balance of the two as a single rep maximum clean or even bench press would be.
I can see why he despised the lack of chest development in men. How can a man build a house or build a dam to save his house from a flood or protect his house from bandits or properly have sex with his wife in missionary for more than 5 or 10 minutes without it? Real men not in Cerutty's opinion and mine too.
Finally, the straight leg situps supported at the feet. Most gym supervisors would run over and stop you doing it instantly for fear of back problems. Agreed this is possible and more likely in the untrained. In the athlete it is not so dnagerous to the back unless done incorrectly. Incorrect would be stiffening with tension. The stiffness can cause problems.
The part of it i like is the fact it combines the hip flexors and the abdominals at the same time. Modern preference is to separate the hip flexors from the abs and focus on the abs. I think this is a very good idea for retraining inactive abdominals or returning from an injury or if there is an imbalance in the athlete.
But when we run they work together and so when we train them we should build up to the ability to train them together. This is the one step prior to using them together when running.
I think the current trend of physiology and biomechanical led thinking is something to be wary of. The chances are a future study will show that it's not a good thing to do too much ab work without also using the hip flexors. It was to my coach anyway. Tuck jumps are simply excellent imo.
pete