The temptation is to give them too much, as a puppy they will be happy to go too far.
However the danger is that your are causing damage to the still growing bones, joints and ligaments.
The damage only becomes apparent many years later when they get hip and joint problems years before they should.
simply waiting a few months at this age to engage in full on strenuous exercise will give them years of
fitness for you to enjoy.
Bikejoring, scootering, running miles and miles with you, sled pulling etc, must wait until they are at least a year old.