You can always try doing some quick and simple maths:
If a planet has 1.25 Earth Gravity, a person who weighs 150 pounds on Earth would feel as if s/he weighed 187.5 pounds. Try walking around wearing a 35 pound backpack. Things would fall faster - at 41.25 feet per sec/per sec. If you could jump 3 feet into the air on Earth, the same effort would only enable you to jump about 2 feet 5 inches.
On a world which has 0.75 Earth gravity, the 150 pound person would feel that s/he weighs only 112.5 pounds, things would fall at a rate of about 25 feet per sec/per sec and the effort needed to jump 3 feet on Earth would lift you 4 feet into the air.
The most important thing I think you'd need to bear in mind that the human body has evolved to work in 1 gee, so prolonged exposure to a different gravitational norm, either greater, or lesser, would be likely to have adverse physiological effects, especially on the heart, which would either be working harder in increased gravity, or "overworking" in lesser gravity. As we know, prolonged exposure to zero-gee (freefall) results in a rapid loss of bone mass and blood volume. The corollary is that the same effects would occur, but over a longer period of time, to those exposed to a permanently lower force of gravity than 1 gee. As yet, the effects of long-term exposure to gravity higher than 1 gee are largely unknown, but, at the least, moving and working in a 1 gee plus environment would be very uncomfortable, with possible cardio-vascular, repiratory and circulatory problems ensuing.
In "The Biology of Human Survival: Life and Death in Extreme Environments", Claude A. Piantadosi says: "Human volunteers have tolerated 1.5g for seven days with no apparent ill effects. However, after just twenty-four hours at 2g, evidence of significant fluid imbalance is detectable. At 3g to 4g fatigue is limiting, and above 4g cardiovascular factors limit g tolerance."