So currently you can arrange to meet only 1 person and walk / sit or exercise with them outside but it is not possible to arrange to do this with 2 people. But when you walk you can stop and talk to another person for a length of time. which is surely the same? If you know them amd you’ve all been careful and are vaccinated surely this is better than doing this with strangers at work or in the street. It’s similar that you can have your cleaner or builder come to your home but you can’t have your mum - just seems strange if you’re being responsible and careful.