Since taking the update to OS7 my battery life is awful

Since taking the update to OS7 my battery life is awful. I typically put my watch on the first thing in the morning and my battery lasts all day, through my workout (approximately 1.5 hours). Then in the evening when I put it on the charger there is typically about 30% charge left. However, now I have to recharge after my workout (it is down to about 18% after the workout). In fact am recharging my watch at least twice to make it through the day. Is there a fix for this? I am sad to say I depend on my watch for so much and this just is not convenient.

[Re-Titled by Moderator]