Bath tub arm dips
Using the side of the bathtub for support (or a couch, park bench, etc.), grip the edge with your fingers so they are facing your butt and are shoulder width apart. With your feet firmly planted on the floor about hip distance apart in front of you, slowly lower your butt and lower back towards the floor until your elbows are at a 90-degree angle. Hold for 2-3 seconds, then slowly lift yourself back up. You should feel this in your biceps and your triceps. Do 2-3 sets of 5-7 repetitions each and gradually increase the number of repetitions. This is perfect to do when I am waiting for the water to warm up when I take a shower!