diff --git a/Rakefile b/Rakefile
index f338c21..b3e1ca3 100644
--- a/Rakefile
+++ b/Rakefile
@@ -1,11 +1,13 @@
+# frozen_string_literal: true
+
 require 'bundler/gem_tasks'
 require 'rspec/core/rake_task'
 
 RSpec::Core::RakeTask.new(:spec)
 
-task :default => :build
+task default: :build
 
-task :build => [:gen_all_run_types, :spec]
+task build: %i[gen_all_run_types spec]
 
 desc 'Generate the all_run_types.g.rb file'
 task :gen_all_run_types do
@@ -19,16 +21,17 @@ task :gen_all_run_types do
     filename_sans_extension = filename[0, filename.length - 3]
     parts = filename_sans_extension.to_s.downcase.split(/_|\./)
     run_type = ''
-    parts.each { |part|
+    parts.each do |part|
       run_type += part[0].upcase + part[-(part.length - 1), part.length - 1]
-    }
+    end
     run_type
   end
   puts all_run_types.join(' ')
 
   # Write run types to the generated file, all_run_types.g.rb
   template = File.read(File.join(run_types_path, 'all_run_types.template'))
-  template.gsub!('__RUN_TYPES__', all_run_types.join(' '))
+  template.gsub!('__RUN_TYPE_NAMES__', all_run_types.join(' '))
+  template.gsub!('__RUN_TYPES__', all_run_types.join(', '))
   File.write(File.join(run_types_path, 'all_run_types.g.rb'), template)
   puts "\e[32mDone\e[0m\n\n"
 end
diff --git a/bin/runbypace b/bin/runbypace
new file mode 100644
index 0000000..a3d6f91
--- /dev/null
+++ b/bin/runbypace
@@ -0,0 +1,15 @@
+#!/usr/bin/env ruby
+
+begin
+  require "bundler/setup"
+rescue LoadError
+end
+
+begin
+  require 'runby_pace'
+rescue LoadError
+  require_relative '../lib/runby_pace'
+end
+
+cli = Runby::Cli.new(ARGV)
+exit cli.run
\ No newline at end of file
diff --git a/lib/runby_pace/cli.rb b/lib/runby_pace/cli.rb
new file mode 100644
index 0000000..1b62a77
--- /dev/null
+++ b/lib/runby_pace/cli.rb
@@ -0,0 +1,57 @@
+# frozen_string_literal: true
+
+require 'readline'
+
+module Runby
+  # Command line interface and REPL for RunbyPace
+  class Cli
+    def initialize(args = ARGV)
+      @args = args
+    end
+
+    def run
+      puts 'Runby Pace REPL!'
+      bnd = binding
+      while (input = Readline.readline('🏃 ', true))
+        begin
+          result = bnd.eval input
+        rescue StandardError => e
+          puts "#{e.class}: #{e.message}"
+        else
+          puts result
+        end
+      end
+    end
+
+    def targets(five_k_time, distance_units = :mi)
+      five_k_time = Runby.sanitize(five_k_time).as(RunbyTime)
+      puts "\nIf you can run a 5K in #{five_k_time}, your training paces should be:"
+      RunTypes.all_classes.each do |run_type|
+        run = run_type.new
+        puts "  #{run.description}: #{run.lookup_pace(five_k_time, distance_units)}"
+      end
+      nil
+    end
+
+    # -- Shortcuts
+    def d(*args)
+      Distance.new(*args)
+    end
+
+    def du(*args)
+      DistanceUnit.new(*args)
+    end
+
+    def p(*args)
+      Pace.new(*args)
+    end
+
+    def s(*args)
+      Speed.new(*args)
+    end
+
+    def t(*args)
+      RunbyTime.new(*args)
+    end
+  end
+end
\ No newline at end of file
diff --git a/lib/runby_pace/run_types/all_run_types.template b/lib/runby_pace/run_types/all_run_types.template
index c51b919..0654366 100644
--- a/lib/runby_pace/run_types/all_run_types.template
+++ b/lib/runby_pace/run_types/all_run_types.template
@@ -4,7 +4,11 @@ module Runby
   # Encapsulates data and behavior relating to all run types.
   module RunTypes
     def self.all
-      %w(__RUN_TYPES__)
+      %w[__RUN_TYPE_NAMES__]
+    end
+
+    def self.all_classes
+      [__RUN_TYPES__]
     end
   end
 end
diff --git a/lib/runby_pace/version.rb b/lib/runby_pace/version.rb
index 82ca248..8472b0e 100644
--- a/lib/runby_pace/version.rb
+++ b/lib/runby_pace/version.rb
@@ -1,5 +1,5 @@
 # frozen_string_literal: true
 
 module Runby
-  VERSION = "0.6.#{`git rev-list --count HEAD`}"
+  VERSION = "0.61.#{`git rev-list --count HEAD`}"
 end