diff --git a/IntervalTimer/IntervalTimer.playground/Contents.swift b/IntervalTimer/IntervalTimer.playground/Contents.swift
new file mode 100644
index 0000000..9d86688
--- /dev/null
+++ b/IntervalTimer/IntervalTimer.playground/Contents.swift
@@ -0,0 +1,3 @@
+import UIKit
+
+var greeting = "Hello, playground"
diff --git a/IntervalTimer/IntervalTimer.playground/contents.xcplayground b/IntervalTimer/IntervalTimer.playground/contents.xcplayground
new file mode 100644
index 0000000..7627317
--- /dev/null
+++ b/IntervalTimer/IntervalTimer.playground/contents.xcplayground
@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<playground version='5.0' target-platform='ios' buildActiveScheme='true' executeOnSourceChanges='false' importAppTypes='true'>
+    <timeline fileName='timeline.xctimeline'/>
+</playground>
\ No newline at end of file
diff --git a/IntervalTimer/IntervalTimer.playground/timeline.xctimeline b/IntervalTimer/IntervalTimer.playground/timeline.xctimeline
new file mode 100644
index 0000000..bf468af
--- /dev/null
+++ b/IntervalTimer/IntervalTimer.playground/timeline.xctimeline
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Timeline
+   version = "3.0">
+   <TimelineItems>
+   </TimelineItems>
+</Timeline>
diff --git a/Trainterval.xcodeproj/project.pbxproj b/Trainterval.xcodeproj/project.pbxproj
index a677880..9989610 100644
--- a/Trainterval.xcodeproj/project.pbxproj
+++ b/Trainterval.xcodeproj/project.pbxproj
@@ -52,6 +52,7 @@
 		80465F852544774700710741 /* CollapsibleFormRowView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = CollapsibleFormRowView.swift; sourceTree = "<group>"; };
 		80465F8725447ACE00710741 /* DurationPicker.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = DurationPicker.swift; sourceTree = "<group>"; };
 		80465F892547A74700710741 /* ActiveTimerView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ActiveTimerView.swift; sourceTree = "<group>"; };
+		80A341B92905DA0F0065F79E /* IntervalTimer.playground */ = {isa = PBXFileReference; lastKnownFileType = file.playground; path = IntervalTimer.playground; sourceTree = "<group>"; xcLanguageSpecificationIdentifier = xcode.lang.swift; };
 		80E0FEDD254F425100A67912 /* Rest.mp3 */ = {isa = PBXFileReference; lastKnownFileType = audio.mp3; path = Rest.mp3; sourceTree = "<group>"; };
 		80E0FEDE254F425100A67912 /* Warm-Up.mp3 */ = {isa = PBXFileReference; lastKnownFileType = audio.mp3; path = "Warm-Up.mp3"; sourceTree = "<group>"; };
 		80E0FEDF254F425100A67912 /* High Intensity.mp3 */ = {isa = PBXFileReference; lastKnownFileType = audio.mp3; path = "High Intensity.mp3"; sourceTree = "<group>"; };
@@ -150,6 +151,7 @@
 				80465F852544774700710741 /* CollapsibleFormRowView.swift */,
 				80465F8725447ACE00710741 /* DurationPicker.swift */,
 				80465F892547A74700710741 /* ActiveTimerView.swift */,
+				80A341B92905DA0F0065F79E /* IntervalTimer.playground */,
 			);
 			path = IntervalTimer;
 			sourceTree = "<group>";
@@ -482,14 +484,17 @@
 			buildSettings = {
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
 				CODE_SIGN_STYLE = Automatic;
+				CURRENT_PROJECT_VERSION = 1;
 				DEVELOPMENT_ASSET_PATHS = "\"IntervalTimer/Preview Content\"";
 				DEVELOPMENT_TEAM = 9Z6DE6KNJ9;
 				ENABLE_PREVIEWS = YES;
 				INFOPLIST_FILE = IntervalTimer/Info.plist;
+				IPHONEOS_DEPLOYMENT_TARGET = 16.4;
 				LD_RUNPATH_SEARCH_PATHS = (
 					"$(inherited)",
 					"@executable_path/Frameworks",
 				);
+				MARKETING_VERSION = 1.0;
 				PRODUCT_BUNDLE_IDENTIFIER = com.wbrawner.IntervalTimer;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SWIFT_VERSION = 5.0;
@@ -502,14 +507,17 @@
 			buildSettings = {
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
 				CODE_SIGN_STYLE = Automatic;
+				CURRENT_PROJECT_VERSION = 1;
 				DEVELOPMENT_ASSET_PATHS = "\"IntervalTimer/Preview Content\"";
 				DEVELOPMENT_TEAM = 9Z6DE6KNJ9;
 				ENABLE_PREVIEWS = YES;
 				INFOPLIST_FILE = IntervalTimer/Info.plist;
+				IPHONEOS_DEPLOYMENT_TARGET = 16.4;
 				LD_RUNPATH_SEARCH_PATHS = (
 					"$(inherited)",
 					"@executable_path/Frameworks",
 				);
+				MARKETING_VERSION = 1.0;
 				PRODUCT_BUNDLE_IDENTIFIER = com.wbrawner.IntervalTimer;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SWIFT_VERSION = 5.0;
diff --git a/Trainterval.xcodeproj/project.xcworkspace/xcuserdata/wbrawner.xcuserdatad/UserInterfaceState.xcuserstate b/Trainterval.xcodeproj/project.xcworkspace/xcuserdata/wbrawner.xcuserdatad/UserInterfaceState.xcuserstate
new file mode 100644
index 0000000..8953e2e
Binary files /dev/null and b/Trainterval.xcodeproj/project.xcworkspace/xcuserdata/wbrawner.xcuserdatad/UserInterfaceState.xcuserstate differ
diff --git a/Trainterval.xcodeproj/xcuserdata/wbrawner.xcuserdatad/xcschemes/xcschememanagement.plist b/Trainterval.xcodeproj/xcuserdata/wbrawner.xcuserdatad/xcschemes/xcschememanagement.plist
index ac79b5d..c94066f 100644
--- a/Trainterval.xcodeproj/xcuserdata/wbrawner.xcuserdatad/xcschemes/xcschememanagement.plist
+++ b/Trainterval.xcodeproj/xcuserdata/wbrawner.xcuserdatad/xcschemes/xcschememanagement.plist
@@ -9,6 +9,11 @@
 			<key>orderHint</key>
 			<integer>0</integer>
 		</dict>
+		<key>Trainterval.xcscheme_^#shared#^_</key>
+		<dict>
+			<key>orderHint</key>
+			<integer>0</integer>
+		</dict>
 	</dict>
 </dict>
 </plist>
diff --git a/interval-timer.xcworkspace/contents.xcworkspacedata b/interval-timer.xcworkspace/contents.xcworkspacedata
new file mode 100644
index 0000000..f22b2ea
--- /dev/null
+++ b/interval-timer.xcworkspace/contents.xcworkspacedata
@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Workspace
+   version = "1.0">
+   <FileRef
+      location = "container:Trainterval.xcodeproj">
+   </FileRef>
+</Workspace>
diff --git a/interval-timer.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist b/interval-timer.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist
new file mode 100644
index 0000000..18d9810
--- /dev/null
+++ b/interval-timer.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>IDEDidComputeMac32BitWarning</key>
+	<true/>
+</dict>
+</plist>
diff --git a/interval-timer.xcworkspace/xcuserdata/wbrawner.xcuserdatad/UserInterfaceState.xcuserstate b/interval-timer.xcworkspace/xcuserdata/wbrawner.xcuserdatad/UserInterfaceState.xcuserstate
new file mode 100644
index 0000000..3a8a208
Binary files /dev/null and b/interval-timer.xcworkspace/xcuserdata/wbrawner.xcuserdatad/UserInterfaceState.xcuserstate differ
diff --git a/interval-timer.xcworkspace/xcuserdata/wbrawner.xcuserdatad/xcschemes/xcschememanagement.plist b/interval-timer.xcworkspace/xcuserdata/wbrawner.xcuserdatad/xcschemes/xcschememanagement.plist
new file mode 100644
index 0000000..df93e70
--- /dev/null
+++ b/interval-timer.xcworkspace/xcuserdata/wbrawner.xcuserdatad/xcschemes/xcschememanagement.plist
@@ -0,0 +1,30 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>SchemeUserState</key>
+	<dict>
+		<key>IntervalTimer (Playground) 1.xcscheme</key>
+		<dict>
+			<key>isShown</key>
+			<false/>
+			<key>orderHint</key>
+			<integer>2</integer>
+		</dict>
+		<key>IntervalTimer (Playground) 2.xcscheme</key>
+		<dict>
+			<key>isShown</key>
+			<false/>
+			<key>orderHint</key>
+			<integer>3</integer>
+		</dict>
+		<key>IntervalTimer (Playground).xcscheme</key>
+		<dict>
+			<key>isShown</key>
+			<false/>
+			<key>orderHint</key>
+			<integer>0</integer>
+		</dict>
+	</dict>
+</dict>
+</plist>