: HIT training for strength (bodyweight) I've been doing a lot of reading over the last few days and I've come across "HIT: High Intensity Training". Now I like the idea of only having to do 1 set (albeit with slow reps) and

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Please check out the book "Starting Strength" by Mark Rippetoe. Rippetoe teaches five basic barbell exercises where you can linearly progress, i.e. you add weight to the barbell every time you visit the gym. After a few months, when it's too difficult to jump in weight, you progress to the intermediate stage which typically lasts a longer duration than the novice phase.

In Starting Strength, you typically do your heaviest weight for three sets of five reps before jumping up in weight the next workout. This is sufficient to get stronger and be able to lift more weight. The only exercise where you don't do three sets of five is the deadlift; in that exercise you only do one set of five reps.

The great thing about the book is that it's backed by physics, anatomy, etc. and it explains in great detail how to do each exercise and WHY it's done that way. The results speak for themselves -- many people following the method have gained lots of muscle and strength; young, old, weak, strong, etc.

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The "HIT" you describe is a very specific kind of HIT, in that they're specifically advocating one set of as many repetitions as you can stand:

Almost all high intensity training methods involve only performing one, all-out work set per exercise.

That's contrary to the sports science definition of intensity in the context of lifting, which I've usually seen construed to mean "percentage of 1RM". It's also not true of a variety of high-intensity training protocols, which use intervals or multiple sets to sustain high intensities of work output. Regardless, let's use Drew Baye's definition of HIT for the purposes of your question.
From the article you're using as a basis:

Bodybuilding or Strength Training?
High intensity training is not exclusively for bodybuilding or strength training or any one aspect of fitness. High intensity training may be used for a variety of exercise goals, by properly manipulating the relevant training variables. In addition to building muscular strength and size, high intensity training is highly effective for improving cardiovascular and metabolic conditioning along with numerous other measures of health and fitness.

The relevant training variables for focusing on strength rather than bodybuilding are the weight used and the number of repetitions. I am not convinced by the idea that time under tension or energy systems are the relevant variable instead of rep ranges. Controlling the rep range to focus purely on strength rather than metabolic conditioning, endurance, or hypertrophy just means that you should do all-out sets using weights or exercises for which you can only do five or fewer reps. I don't think that's going to be enough training stimulus with bodyweight work, even if you manage to find the exact exercise that is exactly hard enough without being too hard.
If you want to try this approach, I would first notice that nearly all the exercises in the recommended programs on Baye's site are weighted, not bodyweight. That's because a large number of bodyweight exercises make it difficult to get enough training stimulus for continued increases in strength and size with just one set. That said, one set to failure (while maintaining impeccable form) work strike me as sufficient and productive with deadlifts and pull-ups. I would be wary of this approach with one-arm chin-ups, handstand work, and one-arm push-ups. Those exercises involve some skill work and stabilization effort, which mean a significant degree of injury risk when doing sets to failure.

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First off slow rep training is only one method of HIT. Standard HIT (since the 70's) uses a 6 sec rep which is a 2 second positive followed by a 4 second negative. Time under tension will range from 40 seconds up to 120 seconds depending on who you talk to or which muscle groups you are working. 40-70 seconds is typical for strength and hypertrophy whereas 70-90 seconds is more for hypertrophy with less strength. Just like normal training, less reps for strength, more reps (within reason) for size. Anything beyond 90 seconds is for endurance. Typically upper body exercises use 40-70 seconds whereas lower body exercises use 70-90. There have been various rep speeds used in HIT but the key factor is time under tension. So, if doing a 2/4 or 3/3 rep speed you would be doing 8-12 reps or roughly 48-72 seconds of TUT. If doing a 5/5 rep speed which some HIT advocates use that would be a rep range of 4-7. Get the idea? Original Super Slow was a 10/5 rep speed and later was changed to 10/10. They also increased the TUT to 90-120 seconds. However, most have found that more than 90 seconds isn't ideal for either strength or hypertrophy. So, if using original 10/5 that would mean a 4-6 rep range, a 10/10 would mean a 3-5 rep range.

My suggestion would be to follow the original guidelines-
1 set of each exercise
2/4 rep speed
8-12 reps for upper body
12-15 reps for the lower body and core
Perform each set to momentary muscular failure
No more than 12 exercises per workout
Training no more than 3 days per week
Using full-body workouts
Using the double progression method (when you can complete the high rep range on each exercise, add 5% or more to the bar or machine- generally 5-10 pounds for compound exercises and 5 pounds for single joint exercises)
if performing bodyweight-only exercises you will need to learn how to modify the exercise to make it more progressive (changing leverage, etc) or add weight via a weight vest or something similar. Using HIT intensity techniques like pre-exhaust, rest pause, stage reps, etc can make an exercise more intense without adding weight.

"Get A practical Approach to Strength Training" by Matt Brzycki for more info on HIT.