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HTML 

              
                <div id="titleBox">
<h1>Wimpy Animation Skills?</h1>
<p>Flex your muscles with TweenMax & MorphSVG from Green<span>Sock</span></p>
<p>This is a 100% steroid free demo. Brought to you by <a href="https://twitter.com/craig_pointc" target="_blank">@Craig_PointC</a></p>
</div>

<div id="controls">
<button id="masterControl">Give Him Muscles</button>
</div>

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  <title>Muscle Morphing With GSAP and the MorphSVG plugin</title>

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  </g>
  <g id="theEyes" mask="url(#lidMask)">
    <path d="M214.11,72.79c16.23,0.66,28.69,18,27.85,38.72q-0.07,1.75-.27,3.46l-58.51-2.39c0-1.14,0-2.3,0-3.47C184,88.39,197.89,72.13,214.11,72.79Z" fill="#f37a54" fill-rule="evenodd"/>
    <path d="M285.64,72.79c-16.24.66-28.72,18-27.87,38.72,0,1.17.14,2.32,0.27,3.46l58.56-2.39q0.05-1.72,0-3.47C315.73,88.39,301.88,72.13,285.64,72.79Z" fill="#f37a54" fill-rule="evenodd"/>
  </g>
  <g id="chestLines" >
    <path d="M340.07,257.32c-110.38-29-177.45,1.83-177.65,1.92C196.2,235.7,288.65,234.2,340.07,257.32Z" fill="#3d3838"/>
    <path d="M240.89,242.8c5.51-2.29,3.54-19.94,5.92-32,2.61,10.84,1.39,28.75,6.26,32H240.89Z" fill="#3d3838" fill-rule="evenodd"/>
  </g>
  
  
    <g id="eyeBrows">
      <path id="ltEyebrow" d="M186.11,80.33s27,6.76,42.26-3.8l-4.65-13.95S218.65,76.53,186.11,80.33Z" fill="#3d3838" fill-rule="evenodd"/>
      <path id="rtEyebrow" d="M312.82,80.33s-27.07,6.76-42.3-3.8l4.65-13.95S280.25,76.53,312.82,80.33Z" fill="#3d3838" fill-rule="evenodd"/>
    </g>  

</svg>
!

CSS 

              
                @import url(https://fonts.googleapis.com/css?family=Source+Sans+Pro:400,700);

html, body {
	margin: 0;
	padding: 0;
	overflow: hidden;
	background-color: #EFEFEF;
}

#muscles {
	visibility:hidden;
}

#muscleMorph {
	position: absolute;
	opacity:0;
	
}

#chestLines, #muscleRightShadow, #muscleLeftShadow {
	visibility: hidden;
	opacity:0;
}

#controls {
	width:100%;
	padding: 20px 0;
	position: absolute;
	background: #262626;
	text-align:center;
	left:0;
	z-index: 102;
}

button {
	padding: 16px 30px;
	cursor: pointer;
	font-family: 'Source Sans Pro', sans-serif;
	font-weight: 700;
	font-size: 30px;
}

#titleBox {
	width:100%;
	padding: 20px 0;
	background: #262626;
	color:white;
	text-align:center;
	position: absolute;
	top:0;
	left:0;
	z-index: 101;
}

h1, p {
	font-family: 'Source Sans Pro', sans-serif;
	font-weight: 700;
	margin:0;
	padding: 0;
	line-height:1.2;
}

h1 {
	font-size: 2.5em;
}

h1, p span {
	color: #88ce02;
}

a {
  color: #fff;
}
!

JS 

              
                

// Just having some fun with the morphSVG plugin from GreenSock
// Check me out on Twitter - @Craig_PointC
// I'm also a moderator on the GreenSock forums - 
// stop by and say hi: https://greensock.com/forums/ 









var tl = new TimelineMax({paused:true, onComplete: function() {$("#masterControl").html("Make Him Wimpy");} }),
	  tl2 = new TimelineMax({paused:true, onComplete: function() {$("#masterControl").html("Give Him Muscles");} }),
	  st = 1.25,
	  muscles = "weak",
	  eyes = $("#weakEyes"),
	  demo = $("#muscleMorph"),
	  controls = document.getElementById("controls"),
	  titleBox = document.getElementById("titleBox");

TweenMax.set("#weakPants",{transformOrigin:"center"})
TweenMax.set("#chestLines",{transformOrigin:"center", scale:0})
TweenMax.set("#ltEyebrow, #rtEyebrow", {transformOrigin:"center"})
TweenMax.set("#theEyes path", {y:-50})
TweenMax.set(eyes, {rotation:0.01})
TweenMax.set(demo, {xPercent:-50, left:"50%", autoAlpha:1});

// make some muscles timeline
tl
.to(eyes, 0.35, {x:8, y:12, ease:Power2.easeInOut})
.add("rtArm","+=0.35")
.to("#weakRightArm", 0.4, {morphSVG:"#muscleRightArm", ease:Back.easeOut},"rtArm")
.to("#weakRightHand", 0.4, {morphSVG:"#muscleRightHand", ease:Back.easeOut},"rtArm")
.to(eyes, 0.35, {x:-8, y:12, ease:Power2.easeInOut},"+=.3")
.add("ltArm","+=0.35")
.to("#weakLeftArm", 0.4, {morphSVG:"#muscleLeftArm", ease:Back.easeOut},"ltArm")
.to("#weakLeftHand", 0.4, {morphSVG:"#muscleLeftHand", ease:Back.easeOut},"ltArm")
.to(eyes, 0.35, {x:0, y:5,  ease:Power2.easeInOut},"+=.3")
.to(eyes, 0.25, {x:0, y:15,  yoyo:true, repeat:1, repeatDelay:1.5, ease:Power2.easeInOut},"+=1")
.to("#ltArmMaster, #rtArmMaster", 0.2, {y:-10, yoyo:true, repeat:1, ease:Power2.easeInOut, repeatDelay:0.3},"+=1")
.to(eyes, 0.25, {x:0, y:15, ease:Power2.easeInOut},"+=1")
.add("body","+=1")
.to("#weakBaseBody", 0.25, {morphSVG:"#muscleBaseBody", ease:Back.easeOut},"body")
.to("#muscleRightShadow, #muscleLeftShadow", 0.25, {autoAlpha:.6},"body+=0.15")
.to("#chestLines",0.3, {scale:1,autoAlpha:.6}, "body")
.to("#rtWeakPec",0.3,{morphSVG:"#rtMusclePec"},"body")
.to("#ltWeakPec",0.3,{morphSVG:"#ltMusclePec"},"body")
.to("#belly", 0.2, {morphSVG:"#sixPack", autoAlpha:0.6, ease:Back.easeOut},"body+=0.10")
.to("#weakPants", 0.25, {morphSVG:"#musclePants", ease:Back.easeOut, fill:"#88ce02"},"body")
.to(eyes, 1.25, {x:0, y:0, ease:Power1.easeInOut},"+=1")
.add("smile","+=1")
.to("#frown", st, {morphSVG:"#smirk"},"smile")
.to("#ltEyebrow",st , {rotation:10, y:10}, "smile")
.to("#rtEyebrow",st, {rotation:-10, y:10 }, "smile")
.to("#theEyes path", st, {y:0},"smile")
.to("#rtEyebrow, #ltEyebrow",0.1, {y:"-=10", yoyo:true, repeat:3 },"+=1");

// make him wimpy again
tl2
.add("uhoh")
.to("#frown", 0.25, {morphSVG:"#surprise"},"uhoh")
.to("#theEyes path", 0.25, {y:-50},"uhoh")
.to("#ltEyebrow",0.25 , {rotation:0, y:0}, "uhoh")
.to("#rtEyebrow",0.25, {rotation:0, y:0 }, "uhoh")
.add("shrink","+=0.5")
.to("#weakRightArm", 0.4, {morphSVG:"#weakRightArm", ease:Elastic.easeOut},"shrink")
.to("#weakRightHand", 0.4, {morphSVG:"#weakRightHand", ease:Elastic.easeOut},"shrink")
.to("#weakLeftArm", 0.4, {morphSVG:"#weakLeftArm", ease:Elastic.easeOut},"shrink")
.to("#weakLeftHand", 0.4, {morphSVG:"#weakLeftHand", ease:Elastic.easeOut},"shrink")
.to("#weakBaseBody", 0.5, {morphSVG:"#weakBaseBody", ease:Elastic.easeOut},"shrink")
.to("#muscleRightShadow, #muscleLeftShadow", 0.25, {autoAlpha:0},"shrink")
.to("#rtWeakPec",0.2,{morphSVG:"#rtWeakPec"},"shrink")
.to("#ltWeakPec",0.2,{morphSVG:"#ltWeakPec"},"shrink")
.to("#chestLines",0.25, {scale:0,autoAlpha:0}, "shrink")
.to("#belly", 0.25, {morphSVG:"#belly", autoAlpha:1},"shrink")
.to("#weakPants", 0.25, {morphSVG:"#weakPants", ease:Elastic.easeOut, fill:"#b8292f"},"shrink")
.add("sad","+=0.5")
.to(eyes, 0.25, {x:0, y:15, ease:Power2.easeInOut},"sad")
.to(eyes, 0.25, {x:-6, y:15, ease:Power2.easeInOut},"+=0.5")
.to(eyes, 0.25, {x:6, y:15, ease:Power2.easeInOut},"+=0.5")
.to(eyes, 0.45, {x:0, y:0, ease:Power2.easeInOut},"+=0.5")
.to("#frown", 0.5, {morphSVG:"#frown"},"+=0.75")


// master control - won't work if any timeline is active
$("#masterControl").click(function(e) {
    if (!tl.isActive() && !tl2.isActive()) {
		if (muscles == "weak") {
			muscles = "strong";
			tl.seek(0).play();
			} else {
			muscles = "weak";
			tl2.seek(0).play();
			}
		
	}
});

// size the SVG to fit with the title and control panel
function sizeAll() {
  var h = window.innerHeight,
		  w = window.innerWidth,
		  th = titleBox.clientHeight,
		  ch = controls.clientHeight;
		
	if ( w > (h-ch-th)) {
		TweenMax.set(demo, {height:h-ch-th-10, width:(h-ch-th-10),top:th+10});
		TweenMax.set(controls, {y:h-ch});	
		} 
		
	else {
		TweenMax.set(demo, {y:0, width:w-10, height:w-10, top:th+10});
		TweenMax.set(controls, {y:w+th});	
		}
}

$(window).resize(sizeAll);

sizeAll();
!
999px

Console