No, not to get into shape - exercise causes you to exhale CO2 in large quantities, which is Very Bad. No, the environmeddlists are planning to sue individual companies that they believe contribute to global warming and which therefore constitute a "public nuisance".
These companies, through their emissions, caused Hurricane Katrina and any number of other ills, according to the claims. In so doing, environmeddlists are adopting a new tactic: claiming that emissions by individual companies are essentially equivalent to having a neighbor who plays his sound system too loudly, and thus constitute a "public nuisance" - which is subject to redress by law.
Apparently, they fail to understand that most people consider the environmeddlists themselves to constitute a public nuisance.