How to play at second row.

Typically locks are very tall for jumping in the line outs, they're also generally strong for in the scrums.
Lots of people say its essential to be tall if you're going to play at second row but in less your playing at a very high level of rugby you really shouldn't worry about it.

Scrums:

The binding of a second row.

The Second row in the scrums are located behind the prop and hooker, you put your head between them, you first bind with one arm in between the props legs grabbing the props shirt or the top of his shorts.
You bind with your other arm on the other second row, its important to get a strong bind and to get pull yourself tight together as it helps creates a strong and stable scrum.
You want to have your shoulders on the props and hookers ass, also have your legs shoulder width apart and place them as far back so your hips are below your shoulders, meaning your driving upwards, but not to far back otherwise your legs will be to straight and you'll have no power coming from them.
Another thing to do to make sure you drive upwards is to have your eye's looking forward.


Line outs:

Like i said before most the time the locks are the one's jumping in the line out because of their height so learn how (this information comes straight from my guide on lifting and beings lifted in line outs) -
There's lots of ways people like to get into the jump, for example you could have one foot back and bring it forward just as your about to jump or you could simply have both legs together at the start so there's no need to move them untill you actually jump, its down to you to work out your routine as long as the people lifting you know it.
First of all you want to make your actual jump as high as possible so you get to your maximum height as quick as possible, this is very important to winning the line out, you want to elongate your body so your legs are straight and together and your arms are out stretched in the air; during the jump your need to keep your legs straight, move them as little as possible by tensing your legs and core- you may want to work out your core so you can keep rigid and balanced in the air- if your able to stay relatively still in the air it then allows you to completely concentrate on catching the ball, another tip is to always lean towards the center of the line out during your throw as if your hooker doesn't throw the ball straight down the middle then it can make it seem like he did and will occasionally save you from free kicks against you.
When you catch the ball then there will be two options, you should already know which one your going to do based on the hookers or scrumhalf's call.
The first option is to give the ball to the scrumhalf now when doing this take your time to give your scrumhalf a good pass right to his hands, you should have at least a second or two from catching the ball to do this which may not sound like much but its plenty, otherwise your scrumy could be crushed by there flanker or one of the other quick forwards.
The second option is to take the ball into a maul, now once again this will be communicated before hand and all you need to do is turn so your back is to the opposition and your lifters should bind either side of you and then you should hold the ball out for the next player into the maul to take.

Open play:

In open play you should be making lots of crash ball runs (scum half or other back passing ball to you to run at the enemy's defense) or pick and go's,  run hard and use your power to break through the line, learn more about this from my guide here.
You should also know how to ruck.

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