We had a morning like that and I have a funny story wrt to 100/100 and running trying to find good footing.

I went for my swim slot and closed off with a 1000m time trial that is alternating 50m fly and 50m free, so it's like a bike time trial where you have a 1 min climb followed by 1 min flat that you repeat 10 times. Its a fun time trial, so I decided for my 30ish minute transition run I would spend 20 min after my warmup alternating 1 min hard and 1 min tempo to compliment what I did in the pool. The problem was roads and sidewalks were a mess after my swim so found a parking lot of a local multinational company that was empty and clear and used it as a track and did this session on the run.

Edit: and just on my second last interval, the Cisco Security guard came and chased me out of the empty parking lot with no one in it other than solitary 100/100 runner!!! Probably does not help being a brown guy doing sprints in a desolate parking lot... so you just comply!!!!

So far it all feels easy. Most of my runs are 6-8km range with one 11km run and a few around 15km. Mainly for now, my focus is swim with run filler. I am planning a 10km swim "private event" during the holidays as one of my friends is renting a pool for a 4 hrs session for this.