Back for another


We’re back to parkour it seems, since I’m not a big fan of explaining chemical equations and the like.

A lazy vault is one of the many different vaults used in parkour. Personally it is my favourite, since it is easy to do and requires little effort.

How to do it

  1. Take a running start towards something that is stable and safe to vault over. Ideally it would be high enough to reach just above your hips.
  2. Kick off and press one hand against the table. Your legs should swing up, bend slightly, and be pointing in the opposite direction as the hand you used.
  3. Before your feet touch the floor on the other side of the obstacle, press your other hand against the table and then push off.
  4. Repeat as many times as you feel like.

I would suggest practicing this on a something like a small table or maybe a guardrail. That’s basically how it’s done though. Sorry again if the explanation uh… sucked.

Shizuo p14

Stay safe when trying it, kay?


Me trying to teach again.

Touhou 7 (5)This time it’s a bit more like an actual lesson, though. I’m still no good at explaining, it seems.

What is Bond Energy?

Bond energy is the energy required to break apart one mole of covalently bonded gases.

How do we calculate it?

The actual calculation of the bond energy of a compound is quite simple, and there are two ways to do so.

  1. If given 2 of the following—Heat of reaction, Heats of formation of reactants and product (eg. CH4 = -74.73 kJ , C(g) = 716.68 kJ , H(g) = 217.97 kJ)

You may use this formula:

∆Hrxn = ∑ Heat of formation of products – ∑ Heat of formation of reactants

If it is bond formation, then the value of ∆H is negative. If it is dissociation, then ∆H is positive.  Here, we simply add and subtract values.

  1. If given the individual bond energies (eg. Cl-Cl = 244 kJ, C-Br = 285 kJ)

You would have to first establish the steps of breaking apart or combining the components of the molecule. If it is bond formation, then the value of ∆H is negative. If it is dissociation, then ∆H is positive. After figuring out the values for each step, you simply add and subtract to get the final value of ∆Hrxn.

That’s about it.

Me trying to teach.

What is a safety roll?

A safety roll is a move that is used to lessen the effects of impact after jumping from a moderately high place, and is also used to conserve a bit of momentum instead of coming to an abrupt stop after landing. Being able to execute a safety roll is an ability that will come in handy for people planning to practice parkour in the future, and it is a very basic skill to acquire.


  1. Kneel on one leg and put both of your hands on the floor in front of you. This will be the starting position for the roll.
  2. Start pushing yourself off and tuck your head. Your arms will go a little bit under your body while your legs go over. When rolling, you will want to roll from the shoulder aligned with the leg you are kneeling on to the opposite hip. Remember to always tuck your head and keep it safe.
  3. Make sure that after the roll your feet hit the ground, and not any other parts of your legs.
  4. You may stand up and continue running after the roll, or you can simply stop and take a break.

I advise you practice on a mat or grass before rolling on harder surfaces like cement. Sorry if my explanation was confusing. I had a hard time putting everything into words. I’ll have a few more how-to articles in a bit, so I guess this is practice. More than anything, stay safe when practicing!

Touhou 13 (46)