: Best ways to add explosive strength to a barbell training/HIT program? I am a 45 year old male. For 2 months I have been training weights acccording to the Starting Strength program twice a week. That is except for the power

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Firstly, you should understand that you have chosen a goal that will be difficult if not impossible to achieve. If you are currently carrying excess body fat then getting rid of that will improve your jump, but beyond that you will likely only be able to make small improvements.

Explosive power is largely determined by genetics and is not trainable to anywhere near the same extent that strength is trainable. What this means is that if you took a new, non-overweight trainee with an 18" vertical jump and a 60kg max squat, in a year they could reasonably expect to add 100kg to their squat, but maybe only 1" to their vertical jump.

It is also very likely that jumping ability naturally declines with age. [1]

And here's what Rippetoe himself has to say on the matter:

One of the tragic problems of human physical existence is the stubbornness of the neurological system, both to heal itself when damaged or diseased and to adapt to the stresses imposed by performance athletics and a life lived the hard way. We are born with a constrained ability to make our nervous system more efficient: for example, the standing vertical jump (SVJ) is the gold-standard for measuring neuromuscular efficiency. Its value lies in its diagnostic ability - it is not very trainable, and as such it is a very good test of genetic potential for explosion. In fact, training the SVJ misses the point of why it is used. A freak-level SVJ for a male would be 36 inches, and average is about 22 inches. A guy with a SVJ of 10 inches will never improve his ability much more than 25%, no matter how hard he trains. This is because the nerves that control neuromuscular efficiency don't adapt very well or very fast, nerves being among the most specialized tissues in the body.

Rippetoe, Mark and Baker, Andy. Practical Programming for Strength Training, 3rd edition Aasgard Co., page 51

Now, if you still want to add vertical jump training to your program, then I agree that weighted jumps are probably better than power cleans. (They would be better as they are more specialised toward vertical jump, but the purpose of Starting Strength is not to improve one's vertical jump, and so power cleans are used, I would speculate, as they may be close enough to a deadlift to confer some benefits there, and also are a useful start should the trainee want to progress to Olympic lifts.) As for the when, do them at the end of your strength training, so they don't interfere with that, or perhaps before your HIIT, as you'd likely be too tired afterwards.