My main goal in puppy training isn't the 'sit' or the 'down' or the 'stay' or any specific behaviors.
The ONLY thing I work on for the first months (year(s)) is ATTITUDE. Only and all. So with only THAT for me to look for, it helps simplify the training session.
Because my 'job' is to figure out what is motiviating TO MY PUPPY. I haven't (frankly) found that my verbal praise or many treats give the same drive and focus as say, a cat/squirrel tearing across the yard. So what that showed me is that TEACHING my dog 'toy drive' is my 100% goal in life!!!!!!!!!!!!!!!!!!
And so my job/work isn't to decide my puppy won't play with toys. It's for me to figure out how to make myself a whole heck of a lot more fun so they DO want to play and interact with me. When they don't it's cause I have sucked the fun out of the training and the resulting zero focus, slow behaviors (if at all), sniffing, walking off, not listening should be clear to me I have to WORK harder at this.
I've found I have an inclination to easily become the disciplinarian and authoritative when my pups don't listen, and (apparently) three out of 3 of my puppies respond very poorly to this.
So now it's all about how can I make myself more fun. More a leader they WANT to follow and be with. And so they choose to stay with me to play all these crazy fun games of 'sit' or the game of 'down' and the game of 'come' is best of all!!!!!!!!!!!!!
I know the clicker worked best for me because it did really make ME have to learn something new that directly benefited my puppy. So it wasn't her fault if I was slow with the click, or getting the treat, or playing after, it was clearly MY fault. Using the clicker as a marker really improved my timing. (and a good trainer who quickly recognizes when I train to much/long and am frying my puppies brain).
Some good ideas on how to Create a Motivating Toy are:
I always tend to over train with puppies. When I see they are slowing or losing focus, that means I went MINUTES over the training session. The goal is always to STOP training when they are fully engaged and wanting to 'play' the training game. So if I need to do 5 one-minute training sessions during the day rather than 1 five-minute session, then that's what I do.