Get outside and improve your health immediately
So why are so many of us cooped up inside instead of going for a walk?
She looked at the science behind why humans respond to being in nature.
The effects can be quite dramatic.
Florence describes how researchers in Japan took test subjects into forests for brief periods, and looked at the impacts on their sympathetic nervous systems.
"Blood pressure drops, their heart rate variability becomes more resilient when faced with stress, cortisol levels drop," she explains.
"The subjects report an increase in...mood, and vitality, and creativity. And that's just after 20 minutes!"
She adds that control groups that walked in the city experienced markedly less of an of an impact, so it's about more than just getting exercise.
Florence says it varies from person to person, and can also vary in the same person, depending on what's going on in their lives.
Researchers in Finland have found a specific "dose". They recommend we spend five hours a month in a forest.
"That seems to be the minimum dose that's required," she says, in order to, for example, help ward off depression.
We have great parks in North America. What we haven't done as well is making those parks and green spaces accessible for everyone.
If you don't happen to have woodlands nearby, don't worry.
You can even use a city park, Florence says, noting that the Finnish research mostly experimented using city parks.
If nature really does help improve our mental and physical well-being, then it's in the public interest to make sure we can all enjoy it.
"We have great parks in North America," she argues.
"What we haven't done as well is making those parks and green areas accessible for everyone," she points out.
"How do you make sure that schools, for example or office complexes or housing projects do a better job of bringing in and incorporating green spaces?"