How old is your puppy? Is he having joint problems? The best supplements for joint problems are a high quality glucosamine, chondroitin, vitamin C, yucca, fish oil and flax seed oil. Apple cider vinegar is also a great supplement for joint problems. You can give these supplements to your dog at any age.
I've seen people start training their puppies for spring pole at the age of 2-4 months old before. Lower the spring pole closer to the ground. If you're puppy is very young, he's not old enough to start hanging from a spring pole yet. As he gets older (1 year of age at the most), you can lift the spring pole and have him hang from it. I've seen 8 month old dogs hang from spring poles before.