Huh, heart beat 100, that is bad, are u a fatty or anxious
minded guy? Ok, sinus can be anything, since it is link to cardia,
it means the heart is involved. Normal athletes heartbeat is only
60 and some can be even below 60 as professional football does.
When exercise, it should hover around 120, yours is consider high,
i think your breathing got problem with the heart co-ordination.
Try to do slow breathing exercises more often, get back the rthym,
then go slow and easy.
Angel
Witch Doctor