You can not hit the gym and you do not have weights at home. Surely, there is something you can do to get some strength training done? Craig Ballantyne, C.S.C.S. says, "You’ll be surprised how hard you can work without a gym."
Do the following moves to alternately for three sets each, without rest. Then do the remaining three exercises consecutively (again, without rest), doing three sets of each.
Stand with your shoulder blades pulled back your arms extended up and you so you form a Y. Set your feet a little more than shoulder-width apart. Sit back on your hips to lower your body. Go as low as possible without allowing your back to round. Squeeze your glutes and push yourself back up to the starting position. Do 12 reps.
Start from the classic pushup position, keeping your legs straight, and abs tight. As you lower your upper body, bend your right leg and rotate your right knee outwards until it is outside your right elbow. Do no drag your foot. Avoid rotating your torso. Return to the starting position and repeat on your other side. Do eight reps per side.
Source: MSN Health