Time for a new to-do list!
1. take your dog to a city center, a store that allows dogs (pet store?) and on a train station
2. position yourself next to a high target and now only click for circling all the way to your leg (don't click for steps in between) - name it with heel for one side and something else for the other and have a dog follow your leg when you move in a circle around the target away from the dog - then tell him to come to the other side and have him follow the other leg. Use different targets, try it on a very low one too.
3. build your own cavaletti and walk the dog over it - you can use the drawers or boxes of appropriate size and height, put them in a row and walk the dog through, just as you can see on this video
4. try the other version of 2on2off (some already did that, I see): instead of having them go on an object and off, stop in a position and wait, let's try stepping back into 2on2off this time. Position your dog close to a low object behind his back, cue him "back" and reward for stepping on an object or trying to. Slowly, you can have a dog step on higher&higher objects, this is beginning of a handstand, but with young puppies, don't overdo the height. Instead, you can have them back up stairs for example, to challenge them some more without making it too physically demanding. You need to build balance and straight slowly enough for the dog to never be sore after. You can also teach them a "pee" trick: click when they heave one leg, searching the object - before they find it and name it, it's a fun one.
5. put your paw target on a drawer or doors or simply shape the paw touch to a drawers/doors and then select for stronger&stronger touches/pushes. The goal is to have the dog slam the doors or drawer with power, to teach them that they control the movement under their feet and the sound and that it's FUN - my favourite trick for a great see-saw!
6. don't forget on recalls and playing!!! Also, slowly add duration to a sit up, teach crossing paws with the other paw and fade the target, check if the puppy will stay in 2on2off position until "go" even with distractions (toys and food flying around)