This guy has the BEST teaching blog. It is geared for EYFS (Early Years Foundation Stage), but there are TONS of ideas and advice. Very inspiring.
I'm a teacher, get me OUTSIDE here!: outdoor Math
Adult led activity - ordering pipes by length.
Playing and Learning Begins at Home: Make your own Tape Measure!
A really popular outdoor maths activity for FS1 that also promoted a lot of talk and PSED. Outdoor Maths Ideas - Twinkl Blog
What do you do when you don’t know what to do outdoors? | Creative STAR Learning | I'm a teacher, get me OUTSIDE here!
Forest school 6 areas of learning
Forest School Activities
What's your name? Fitness activity for kids. Your kids will get a workout without realizing it when you make fitness into a fun game.
Math sorts - really like this idea! Use with measures in different time signatures.