```ruby
require 'sneakers'
require 'sneakers/runner'

task :environment

namespace :sneakers do
  desc "Start work (set $WORKERS=Klass1,Klass2)"
  task :run  => :environment do

    workers, missing_workers = Sneakers::Utils.parse_workers(ENV['WORKERS'])

    unless missing_workers.empty?
      puts "Missing workers: #{missing_workers.join(', ')}" if missing_workers
      puts "Did you `require` properly?"
      exit(1)
    end

    if workers.empty?
      puts <<EOF
Error: No workers found.
Please set the classes of the workers you want to run like so:

  $ export WORKERS=MyWorker,FooWorker
  $ rake sneakers:run

EOF
      exit(1)
    end

    r = Sneakers::Runner.new(workers)

    r.run
  end
end
```

Modify rake task to take worker count as ENV variable
user
```ruby
require 'sneakers'
require 'sneakers/runner'

task :environment

namespace :sneakers do
  desc "Start work (set $WORKERS=Klass1,Klass2)"
  task :run  => :environment do

    workers, missing_workers = Sneakers::Utils.parse_workers(ENV['WORKERS'])

    unless missing_workers.empty?
      puts "Missing workers: #{missing_workers.join(', ')}" if missing_workers
      puts "Did you `require` properly?"
      exit(1)
    end

    if workers.empty?
      puts <<EOF
Error: No workers found.
Please set the classes of the workers you want to run like so:

  $ export WORKERS=MyWorker,FooWorker
  $ rake sneakers:run

EOF
      exit(1)
    end
    opts = (ENV['WORKER_COUNT'].present? ? {:workers => ENV['WORKER_COUNT'].to_i} : {})
    r = Sneakers::Runner.new(workers, opts)

    r.run
  end
end
```
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