If you can't make it to the gym or you are away from home, no problem!
Where ever you are, you can make time to do this simple routine which will raise your heart rate, burn calories and build strength. If the totals in the routine don't challenge you enough, raise them or do more sets. In between sets rest until your heart rate is normal then smash it hard again, trying to beat your previous time or increase the reps. The key is to always try to challenge your self even if it's just one more rep, the important aspect is the one more rep!