Physical activity

Research on the optimal amount of aerobic activity per week
Sitting too much decreases lifespan (fidgeting reduces harm from long sitting: https://pubmed.ncbi.nlm.nih.gov/26416340)

It seems like it's perfectly normal to exercise right after bedtime and right before bedtime

https://www.reddit.com/r/weightroom/comments/9sil78/effects_of_evening_exercise_on_sleep_in_healthy/
Effects of Evening Exercise on Sleep in Healthy Participants: A Systematic Review and Meta-Analysis [2018]
Conclusion:
Overall, the studies reviewed here do not support the hypothesis that evening exercise negatively affects sleep, in fact rather the opposite. However, sleep-onset latency, total sleep time, and SE might be impaired after vigorous exercise ending ≤ 1 h before bedtime.