Above my maximum heart rate?

I am 43, 180lbs and have been working out 3-5 times a week for 5 months. I alternate between cardio and crossfit workouts. During my cardio workouts I usually will run on the treadmill for 3 miles if I run at 6.0 mph our less my heart rate stays about 150 per minute or less, if I push the speed up or do sprints etc… my heart rate goes up to at or sometimes above my maximum of 177 but I dont feel like I am really winded or pushing it too hard. Should I be going above my max or just pay attention to how I feel? My goal is to lose fat and increase overall fitness.

what should i wear during my triathlon swim?

I am doing my first triathlon in 5 months and am going to start my swimming training this week. What can I get to train in and race in? I don’t want to buy something expensive just to race in. I am thinking I buy one of those wetsuits that just cover your legs up…similar to the ones the olympic athletes race in. I don’t want to train in bulky swim trunks. I suppose I could go with the speedo…although I might be slightly uncomfortable at first.

What is the best Triathlon Training group?

Can you tell me if you have direct experience w/various ways and groups that do the training.

First time TRI participant. Have about 4.5 months….