A quick example of how you might work with the Nike+ API. You'll need to get your own access key at https://developer.nike.com/console to test this code.

person.rb

require 'httparty'

APP_ID = 'nike'
BASE_URL = 'https://api.nike.com'

class Person

  def initialize(access_token)
    self.access_token = access_token
  end

  def data
    @data ||= begin
      api_request('/me/sport').parsed_response
    end
  end

  private

  def access_token
    @access_token
  end

  def access_token=(value)
    @access_token = value
  end

  def api_request(endpoint)
    options = { headers: { 'Accept' => 'application/json', 'appid' => APP_ID } }
    HTTParty.get("#{BASE_URL}#{endpoint}?access_token=#{access_token}", options)
  end

end

p = Person.new('<YOUR ACCESS TOKEN>')
p.data # => {"experienceTypes"=>["FUELBAND"], "summaries"=>[{"experienceType"=>"ALL", "records"=>{"lifetimeFuel"=>142358}} ... ]}