Perhaps they are 'not as young as they used to be'. Or maybe they have been spending your treat money on expensive Pilates or yoga classes.
Now that the warmer weather is with us, let me recommend my special training programme, the 'WOBBLIE' (Working Out with Bouncing Bertie while Licking Ice-cream Exercise).
Your human will love the unique combination of keep-fit and indulgence. This is how it works.
It is a beautiful day and time for your afternoon walk. You quickly deduce, from the direction of travel and the clement weather conditions, that your human is heading for the ice-cream shop, about a mile away. Normally you would perform your afternoon 'business' pretty soon once you are the obligatory hundred yards away from your home, but today you sense an opportunity to give your human an extra work-out. So you thoughtfully hold it all in until you have reached the ice-cream place and she has been inside and purchased a cone generously filled with her favourite flavour (coffee or vanilla, since you asked).
You can picture the scene. The sun is shining, your human is walking along, your lead in one hand, ice-cream cone in the other, happily licking away.
Now is the time to 'evacuate'. What better test of dexterity and balance than to have her place your lead in the ice-cream hand, reach for the poop bag with the other, bend over and pick up the poop, holding the ice-cream as far away as possible? In Level 2 of the exercise you might want to jerk the lead a little at this point. Level 3 requires her to be wearing a white top.
One must recognise that it might take some practice before your human can complete the exercise without either falling over, letting go your lead or losing a single morsel of the precious ice-cream.
But I am sure your human will be grateful for your contribution to her well being and will reward you with at least the pointy tip of the ice-cream cone.
Level 4 involves, of course, your human simultaneously taking a selfie while conducting the pick up operation. Gail has not yet reached this stage. (In fact when she heard about it she asked, in a rather exasperated tone, did I expect her to grow a third arm or what?)
So anyway, here is a nice photo of cherry blossom, taken later on the walk. Look at that blue sky!
P.S. Do let me know how your human gets on with the WOBBLIE.