It sure is HOT out today! Stay inside and try this workout, no excuses! This is an AMRAP- As Many Reps As Possible. This was from a June Fitness Fire class (class cal link: http://www.inspiredathleticmovement.com/class-schedule.html). 
Set a timer for 8 (you can start lower and work your way up) minutes and see how many reps you can do. It is a great way to see improvement and push yourself to go faster the next time you do it. I like to do the same AMRAP workout at least every couple months as a base for my current athletic level. If you have weights, or a medicine ball, or some cans of soup... use a medium weight. If your back hurts, go down in weight. Bodyweight is also a great option!
1. Alternating reverse lunge with front reach from low lunge position (8 on each side)
2. Speed squats (16)
3. Jumping jacks with overhead reach (8)
That's it! Simple and can be done ANYWHERE! Write down your total number of reps so you can try to beat yourself next time. Let us know how you do!!