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The concept is good. It's logical, but there's so many problems with training this way. So much of the body get's neglected, your just leaving yourself wide open for injury. Like doing shit loads of precisions, aside from the potential joint damage due to other muscle groups underfiring through neglect your putting alot of strain on the main muscle used in the jump - the hamstring. Training nothing but parkour will leave you with a really lame posterior chain because it just won't get worked properly. The PC is infact of paramount importance, and a strong PC will reduce chances of things like hamstring pulls. The hams are extremely important in parkour as they're used for jumping and running. They're the big players in it, more so that quads which is a common misconception. You can do squats till the cows come home and get strong quads but how are you going to train your hamstrings?

Training nothin but parkour is an incomplete way of training. Far too much neglect for other important muscles. If your only training once a week or something socially, then train how you like because it's unlikely to be that dangerous at such low intensity, but if your really serious about your training and you going out there 3/4 times a week, your asking for an injury.

It wouldn't keep coming up if people listened......

It's more beneficial. Training his way infact isn't beneficial past a time, that's why we have cycles. Pattern burn out is only the tip of the iceburg.

Blane used to have the right idea with his conditioning, then he went to Lisses and got brainwashed by people with lots of skill and little knowledge of human physiology. You don't hear so much about all those in Lisses who can no longer train due to their joints being f**ked. It's a delightful concept don't get me wrong - just go out and do parkour basically, but even in this state of unstructured training, there's still structure, it's just less thought out. Instead of concentrating on certain muscle groups to get a generally prepared body you just do what you feel and get a multitude of inbalances from an unbalanced training method. People will just do what they enjoy doing and leave out the excercises they find boring or too hard. These are normally important excercises, because they're normally the areas that are weaker due to you not doing anything to help them because of the latter reasons.

There was a good post somewhere which really explained why his method is no good, i think it went something like:

This isnt his theory its a theory that persists through out all sports and its tantamount to lazy conditioning approach and displays a lack of understanding about physiology, i posted some thing similar about bodyweight training but the same principles apply

" The biggest obstacle is the speed barrier, the speed barrier occurs when the trainer performs numerous repetitions of the same speed exercise, which forms a dynamic stereotype in the central nervous system. This basically means that the athlete adapts to the specific characteristics of the speed drill or movement and locks in those parameters as the norm. Eventually, the speed barrier sets in and the athlete can no longer improve upon his or her speed experession. (hence training power/strength/endurance together defeats this training effect)

Structural Barriers: These include muscle mass (cross-sectional area), anthropometric relationships, bone, muscle, tendon and ligament biomechanical factors (stiffness, elasticity, sticking points, and strength).

Functional Barriers: These are barriers dictated by your nervous system. They mostly involve inhibitory processes that decrease neural drive or activation of your muscle machinery - primarily to protect yourself from injury.

If there were no barriers to strength/speed attainment: we'd all be power cleaning 200kg, squatting 400kg, and benching 200kg and standing long jumping 11 feet with ease.

In order for what your recommending training to be effective, however, these higher speeds must be attempted against relatively heavy resistances. We've all seen the newbs flinging around light weights in the gym; the problem is that more than half of the movement is spent trying to decelerate the bar so it doesn't fly out of their hands or excessively distract their joints. Otherwise light weight boxers would have the most powerful punches in the world because they're accelerrating their smaller arms for hundreds of reps at high speed per sparring round.

So to round that up, training at high speed only your body will achieve neural stagnation and speed wont improve, structurally you will stagnate and your motor patterns will become burnt out.

The human body is a physiologically lazy organic machine. It will do no more than you demand of it. It doesn't get bigger and stronger because it's bored. It gets bigger and stronger only when faced with no other option.

The real question is, why are you fixated on doing "bodyweight/technique only conditioning." I could understand if you are really limited in your eqp choices but even then you can push a car, hoist a sandbag, press a log, deadlift stuff, carry rocks...all this stuff might be a refreshing change, but it isn't necessary to limit yourself to bodyweight only! Do you believe that body weight training is somehow more holistic that the science is some how wrong, that parkour is somehow different to other athletic persuits that it need special kinds of conditioning?"

training in sport/parkour makes the strength you've gained in the weight room specific.

Traceurs can't be afraid of the unknown and need to escape the preconceived notions that shelter their minds

Something to that effect anyway.......