Training sessions are kept very short and sweet. If he does what I ask a few times, we leave it there... perhaps they are not long enough? His little tail wags away and he is completely attentive throughout.
We play with him on and off all day long. But we try not to pander to him every single time he wants our attention.
He just picked him up and put him in. Lol, we have had many clashes over the way Barney is dealt with. Bless OH, he does try, but he needs more training than Barney I think, lol. He is never confrontational, but just can't 'think dog' and cant get the concept of focusing on what you do want from him, rather than what you don't want. He is keen to learn though so is following the training and advice closely. There are some great ideas there... I will show him these replies. Thank you.
And lastly, no, I stopped the rough play straight away! lol! He now plays fetch with him instead, lol! Must less risky! 
Training - as others have said, training in short regularly bursts is the best bet... I find that, even at 3 yrs old, Honey is excited at the end of a training session... I tend to finish with a sit/wait and distract her with a scattering of food around her - when I release her she has a lot of treat hoovering to do, so this helps her wind down. Obviously a young pup can't be expected to wait while treats are thrown around in front of him, but a scatter feed, or some treats hidden somewhere, will give him something else to focus on to wind down after his training...
As Mooching says, it is very important we reward puppies for calm behaviour - we all to often only give reinforcement for activity... either in training, playing or telling them to calm down... reward when he is lying down calmly, and he will soon learn he doesn't need to be doing things to gain your approval!!! I'm helping at a puppy class at the minute, and the calmest pups in the room are the ones where the owner rewards the calm behaviour... and the noisiest ones are the ones where the owner pays them no attention while they are sitting quietly, but desperately tries to quieten them down (distracting with toys/treats etc) when they bark or whine!!!
"He just picked him up and put him in" - but he's not confrontational? So you'd be happy if you were out at a club and the bouncers came over, picked you up and put you into a different part of the club? There was obviously no confrontational intent, but being picked up and put somewhere else is confrontational... you are much better luring him into his bed - and gradually training him to go there on command (or even better because he wants to be in his bed!). Put yummy treats in there... make it a rewarding place to be.
The best thing you can provide is clear, consistent boundaries/rules, enforced in a kind manner. Work
with your pup, and get him to do things because he
wants to do it... and you'll have a fantastic adult dog in time, who can make all those who warned you to be careful of cockers eat their words!!!
